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1320690 = 235719331
BaseRepresentation
bin101000010011011110010
32111002122110
411002123302
5314230230
644150150
714140260
oct5023362
92432573
101320690
11822288
12538356
13373197
14265430
151b14b0
hex1426f2

1320690 has 64 divisors (see below), whose sum is σ = 3824640. Its totient is φ = 285120.

The previous prime is 1320667. The next prime is 1320721. The reversal of 1320690 is 960231.

It is a super-2 number, since 2×13206902 = 3488444152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3825 + ... + 4155.

It is an arithmetic number, because the mean of its divisors is an integer number (59760).

21320690 is an apocalyptic number.

1320690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1912320).

1320690 is an abundant number, since it is smaller than the sum of its proper divisors (2503950).

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

1320690 is a wasteful number, since it uses less digits than its factorization.

1320690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1320690 is about 1149.2127740327. The cubic root of 1320690 is about 109.7152414390.

The spelling of 1320690 in words is "one million, three hundred twenty thousand, six hundred ninety".

Divisors: 1 2 3 5 6 7 10 14 15 19 21 30 35 38 42 57 70 95 105 114 133 190 210 266 285 331 399 570 662 665 798 993 1330 1655 1986 1995 2317 3310 3990 4634 4965 6289 6951 9930 11585 12578 13902 18867 23170 31445 34755 37734 44023 62890 69510 88046 94335 132069 188670 220115 264138 440230 660345 1320690