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1391220 = 2232559131
BaseRepresentation
bin101010011101001110100
32121200101200
411103221310
5324004340
645452500
714553015
oct5235164
92550350
101391220
11870276
12571130
1339930c
1428300c
151c7330
hex153a74

1391220 has 72 divisors (see below), whose sum is σ = 4324320. Its totient is φ = 361920.

The previous prime is 1391207. The next prime is 1391233. The reversal of 1391220 is 221931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1391207) and next prime (1391233).

It is a super-3 number, since 3×13912203 = 8078090083331544000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1391193 and 1391202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10555 + ... + 10685.

It is an arithmetic number, because the mean of its divisors is an integer number (60060).

21391220 is an apocalyptic number.

1391220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 1179×1180.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162160).

1391220 is an abundant number, since it is smaller than the sum of its proper divisors (2933100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391220 is a wasteful number, since it uses less digits than its factorization.

1391220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1391220 is about 1179.4998940229. The cubic root of 1391220 is about 111.6345443607.

The spelling of 1391220 in words is "one million, three hundred ninety-one thousand, two hundred twenty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 59 60 90 118 131 177 180 236 262 295 354 393 524 531 590 655 708 786 885 1062 1179 1180 1310 1572 1770 1965 2124 2358 2620 2655 3540 3930 4716 5310 5895 7729 7860 10620 11790 15458 23187 23580 30916 38645 46374 69561 77290 92748 115935 139122 154580 231870 278244 347805 463740 695610 1391220