257218995 has 32 divisors (see below), whose sum is σ = 451609344. Its totient is φ = 123977600.

The previous prime is 257218981. The next prime is 257218999. The reversal of 257218995 is 599812752.

It is not a de Polignac number, because 257218995 - 2⁸ = 257218739 is a prime.

It is a super-2 number, since 2×257218995² = 132323222777620050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257218999) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 24040 + ... + 33050.

It is an arithmetic number, because the mean of its divisors is an integer number (14112792).

Almost surely, 2^257218995 is an apocalyptic number.

257218995 is a deficient number, since it is larger than the sum of its proper divisors (194390349).

257218995 is a wasteful number, since it uses less digits than its factorization.

257218995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9203.

The product of its digits is 453600, while the sum is 48.

The square root of 257218995 is about 16038.0483538366. The cubic root of 257218995 is about 635.9666555241.

It can be divided in two parts, 25721 and 8995, that added together give a triangular number (34716 = T₂₆₃).

The spelling of 257218995 in words is "two hundred fifty-seven million, two hundred eighteen thousand, nine hundred ninety-five".