155239056 has 150 divisors (see below), whose sum is σ = 507961350. Its totient is φ = 44255232.

The previous prime is 155239031. The next prime is 155239069. The reversal of 155239056 is 650932551.

It can be written as a sum of positive squares in only one way, i.e., 138297600 + 16941456 = 11760^2 + 4116^2 .

It is a super-2 number, since 2×155239056² = 48198329015542272, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 155239056.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 345520 + ... + 345968.

It is an arithmetic number, because the mean of its divisors is an integer number (3386409).

Almost surely, 2^155239056 is an apocalyptic number.

155239056 is a gapful number since it is divisible by the number (16) 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 155239056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253980675).

155239056 is an abundant number, since it is smaller than the sum of its proper divisors (352722294).

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

155239056 is an equidigital number, since it uses as much as digits as its factorization.

155239056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The square root of 155239056 is about 12459.4966190452. The cubic root of 155239056 is about 537.4445514101. Note that the first 3 decimals are identical.

The spelling of 155239056 in words is "one hundred fifty-five million, two hundred thirty-nine thousand, fifty-six".