257970986 has 32 divisors (see below), whose sum is σ = 485990400. Its totient is φ = 102050928.

The previous prime is 257970983. The next prime is 257970989. The reversal of 257970986 is 689079752.

It is an interprime number because it is at equal distance from previous prime (257970983) and next prime (257970989).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257970983) 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 15 ways as a sum of consecutive naturals, for example, 5546 + ... + 23381.

It is an arithmetic number, because the mean of its divisors is an integer number (15187200).

Almost surely, 2^257970986 is an apocalyptic number.

257970986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

257970986 is a deficient number, since it is larger than the sum of its proper divisors (228019414).

257970986 is a wasteful number, since it uses less digits than its factorization.

257970986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28963 (or 28949 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 257970986 is about 16061.4752124455. The cubic root of 257970986 is about 636.5858113317.

The spelling of 257970986 in words is "two hundred fifty-seven million, nine hundred seventy thousand, nine hundred eighty-six".