257218983 has 60 divisors (see below), whose sum is σ = 450512040. Its totient is φ = 145823328.

The previous prime is 257218981. The next prime is 257218999. The reversal of 257218983 is 389812752.

It is a happy number.

It is not a de Polignac number, because 257218983 - 2¹ = 257218981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257218981) 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 59 ways as a sum of consecutive naturals, for example, 908760 + ... + 909042.

It is an arithmetic number, because the mean of its divisors is an integer number (7508534).

Almost surely, 2^257218983 is an apocalyptic number.

257218983 is a deficient number, since it is larger than the sum of its proper divisors (193293057).

257218983 is a wasteful number, since it uses less digits than its factorization.

257218983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 522 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 257218983 is about 16038.0479797262. The cubic root of 257218983 is about 635.9666456342.

The spelling of 257218983 in words is "two hundred fifty-seven million, two hundred eighteen thousand, nine hundred eighty-three".