156909440 has 32 divisors (see below), whose sum is σ = 375113160. Its totient is φ = 62763520.

The previous prime is 156909433. The next prime is 156909457. The reversal of 156909440 is 44909651.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×156909440² = 49241144722227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 156909394 and 156909403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121946 + ... + 123225.

Almost surely, 2^156909440 is an apocalyptic number.

156909440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156909440 is an abundant number, since it is smaller than the sum of its proper divisors (218203720).

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

156909440 is an equidigital number, since it uses as much as digits as its factorization.

156909440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245190 (or 245178 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 156909440 is about 12526.3498274637. The cubic root of 156909440 is about 539.3653265923.

The spelling of 156909440 in words is "one hundred fifty-six million, nine hundred nine thousand, four hundred forty".