156990907 has 4 divisors (see below), whose sum is σ = 157240336. Its totient is φ = 156741480.

The previous prime is 156990887. The next prime is 156990961. The reversal of 156990907 is 709099651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 709099651 = 13 ⋅54546127.

It is a cyclic number.

It is not a de Polignac number, because 156990907 - 2¹¹ = 156988859 is a prime.

It is a super-2 number, since 2×156990907² = 49292289761365298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156990307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123768 + ... + 125029.

It is an arithmetic number, because the mean of its divisors is an integer number (39310084).

Almost surely, 2^156990907 is an apocalyptic number.

156990907 is a deficient number, since it is larger than the sum of its proper divisors (249429).

156990907 is an equidigital number, since it uses as much as digits as its factorization.

156990907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249428.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 156990907 is about 12529.6012306857. The cubic root of 156990907 is about 539.4586561643.

The spelling of 156990907 in words is "one hundred fifty-six million, nine hundred ninety thousand, nine hundred seven".