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1381212 = 22357229
BaseRepresentation
bin101010001001101011100
32121011200000
411101031130
5323144322
645334300
714511600
oct5211534
92534600
101381212
118637a8
12567390
133948b1
1427d500
151c43ac
hex15135c

1381212 has 108 divisors (see below), whose sum is σ = 4357080. Its totient is φ = 381024.

The previous prime is 1381207. The next prime is 1381213. The reversal of 1381212 is 2121831.

It is a tau number, because it is divible by the number of its divisors (108).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381213) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 47614 + ... + 47642.

21381212 is an apocalyptic number.

1381212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

1381212 is the 588-th decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2178540).

1381212 is an abundant number, since it is smaller than the sum of its proper divisors (2975868).

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

1381212 is a wasteful number, since it uses less digits than its factorization.

1381212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 41 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1381212 is about 1175.2497606892. The cubic root of 1381212 is about 111.3662119380.

It can be divided in two parts, 13812 and 12, that added together give a cube (13824 = 243).

The spelling of 1381212 in words is "one million, three hundred eighty-one thousand, two hundred twelve".

Divisors: 1 2 3 4 6 7 9 12 14 18 21 27 28 29 36 42 49 54 58 63 81 84 87 98 108 116 126 147 162 174 189 196 203 243 252 261 294 324 348 378 406 441 486 522 567 588 609 756 783 812 882 972 1044 1134 1218 1323 1421 1566 1701 1764 1827 2268 2349 2436 2646 2842 3132 3402 3654 3969 4263 4698 5292 5481 5684 6804 7047 7308 7938 8526 9396 10962 11907 12789 14094 15876 16443 17052 21924 23814 25578 28188 32886 38367 47628 49329 51156 65772 76734 98658 115101 153468 197316 230202 345303 460404 690606 1381212