157791986 has 12 divisors (see below), whose sum is σ = 260161566. Its totient is φ = 71723520.

The previous prime is 157791967. The next prime is 157792007. The reversal of 157791986 is 689197751.

It can be written as a sum of positive squares in only one way, i.e., 84364225 + 73427761 = 9185^2 + 8569^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 325775 + ... + 326258.

Almost surely, 2^157791986 is an apocalyptic number.

157791986 is a deficient number, since it is larger than the sum of its proper divisors (102369580).

157791986 is a wasteful number, since it uses less digits than its factorization.

157791986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652057 (or 652046 counting only the distinct ones).

The product of its digits is 952560, while the sum is 53.

The square root of 157791986 is about 12561.5280121488. The cubic root of 157791986 is about 540.3746668262.

The spelling of 157791986 in words is "one hundred fifty-seven million, seven hundred ninety-one thousand, nine hundred eighty-six".