257157986 has 16 divisors (see below), whose sum is σ = 412328448. Its totient is φ = 119988000.

The previous prime is 257157973. The next prime is 257158037. The reversal of 257157986 is 689751752.

It is a super-2 number, since 2×257157986² = 132260459527152392, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 66290 + ... + 70061.

It is an arithmetic number, because the mean of its divisors is an integer number (25770528).

Almost surely, 2^257157986 is an apocalyptic number.

257157986 is a deficient number, since it is larger than the sum of its proper divisors (155170462).

257157986 is a wasteful number, since it uses less digits than its factorization.

257157986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136417.

The product of its digits is 1058400, while the sum is 50.

The square root of 257157986 is about 16036.1462328079. The cubic root of 257157986 is about 635.9163705420.

The spelling of 257157986 in words is "two hundred fifty-seven million, one hundred fifty-seven thousand, nine hundred eighty-six".