156990789 has 12 divisors (see below), whose sum is σ = 234079872. Its totient is φ = 101284200.

The previous prime is 156990773. The next prime is 156990791. The reversal of 156990789 is 987099651.

156990789 is a `hidden beast` number, since 1 + 569 + 9 + 0 + 78 + 9 = 666.

It is not a de Polignac number, because 156990789 - 2⁴ = 156990773 is a prime.

It is a super-2 number, since 2×156990789² = 49292215661685042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156990719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 281067 + ... + 281624.

It is an arithmetic number, because the mean of its divisors is an integer number (19506656).

Almost surely, 2^156990789 is an apocalyptic number.

It is an amenable number.

156990789 is a deficient number, since it is larger than the sum of its proper divisors (77089083).

156990789 is a wasteful number, since it uses less digits than its factorization.

156990789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562728 (or 562725 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 156990789 is about 12529.5965218358. The cubic root of 156990789 is about 539.4585210055.

The spelling of 156990789 in words is "one hundred fifty-six million, nine hundred ninety thousand, seven hundred eighty-nine".