156857985 has 64 divisors (see below), whose sum is σ = 295925760. Its totient is φ = 78693120.

The previous prime is 156857971. The next prime is 156857989. The reversal of 156857985 is 589758651.

156857985 is a `hidden beast` number, since 1 + 5 + 68 + 579 + 8 + 5 = 666.

It is not a de Polignac number, because 156857985 - 2¹⁰ = 156856961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156857989) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 154339 + ... + 155351.

It is an arithmetic number, because the mean of its divisors is an integer number (4623840).

Almost surely, 2^156857985 is an apocalyptic number.

156857985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

156857985 is a deficient number, since it is larger than the sum of its proper divisors (139067775).

156857985 is a wasteful number, since it uses less digits than its factorization.

156857985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1089 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 54.

The square root of 156857985 is about 12524.2957885863. The cubic root of 156857985 is about 539.3063624809.

The spelling of 156857985 in words is "one hundred fifty-six million, eight hundred fifty-seven thousand, nine hundred eighty-five".