257516138 has 8 divisors (see below), whose sum is σ = 421390080. Its totient is φ = 117052780.

The previous prime is 257516137. The next prime is 257516159. The reversal of 257516138 is 831615752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×257516138³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257516131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5852618 + ... + 5852661.

It is an arithmetic number, because the mean of its divisors is an integer number (52673760).

Almost surely, 2^257516138 is an apocalyptic number.

257516138 is a deficient number, since it is larger than the sum of its proper divisors (163873942).

257516138 is a wasteful number, since it uses less digits than its factorization.

257516138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11705292.

The product of its digits is 50400, while the sum is 38.

The square root of 257516138 is about 16047.3093694862. The cubic root of 257516138 is about 636.2114538246.

The spelling of 257516138 in words is "two hundred fifty-seven million, five hundred sixteen thousand, one hundred thirty-eight".