156985907 has 4 divisors (see below), whose sum is σ = 169061760. Its totient is φ = 144910056.

The previous prime is 156985889. The next prime is 156985937. The reversal of 156985907 is 709589651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 709589651 = 11159 ⋅63589.

It is a cyclic number.

It is not a de Polignac number, because 156985907 - 2¹⁶ = 156920371 is a prime.

It is a super-2 number, since 2×156985907² = 49289149993225298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156985937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6037907 + ... + 6037932.

It is an arithmetic number, because the mean of its divisors is an integer number (42265440).

Almost surely, 2^156985907 is an apocalyptic number.

156985907 is a deficient number, since it is larger than the sum of its proper divisors (12075853).

156985907 is a wasteful number, since it uses less digits than its factorization.

156985907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12075852.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 156985907 is about 12529.4017015977. The cubic root of 156985907 is about 539.4529290345.

The spelling of 156985907 in words is "one hundred fifty-six million, nine hundred eighty-five thousand, nine hundred seven".