155972520 has 256 divisors, whose sum is σ = 597888000. Its totient is φ = 35769600.

The previous prime is 155972519. The next prime is 155972599. The reversal of 155972520 is 25279551.

155972520 is a `hidden beast` number, since 15 + 59 + 72 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 225375 + ... + 226065.

It is an arithmetic number, because the mean of its divisors is an integer number (2335500).

Almost surely, 2^155972520 is an apocalyptic number.

155972520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155972520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298944000).

155972520 is an abundant number, since it is smaller than the sum of its proper divisors (441915480).

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

155972520 is a wasteful number, since it uses less digits than its factorization.

155972520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 155972520 is about 12488.8958679300. The cubic root of 155972520 is about 538.2896502323.

The spelling of 155972520 in words is "one hundred fifty-five million, nine hundred seventy-two thousand, five hundred twenty".