257138269 has 8 divisors (see below), whose sum is σ = 263570688. Its totient is φ = 250746000.

The previous prime is 257138263. The next prime is 257138281. The reversal of 257138269 is 962831752.

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

It is a cyclic number.

It is not a de Polignac number, because 257138269 - 2¹³ = 257130077 is a prime.

It is a super-2 number, since 2×257138269² = 132240178768632722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257138263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3144 + ... + 22894.

It is an arithmetic number, because the mean of its divisors is an integer number (32946336).

Almost surely, 2^257138269 is an apocalyptic number.

It is an amenable number.

257138269 is a deficient number, since it is larger than the sum of its proper divisors (6432419).

257138269 is a wasteful number, since it uses less digits than its factorization.

257138269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20075.

The product of its digits is 181440, while the sum is 43.

The square root of 257138269 is about 16035.5314536189. The cubic root of 257138269 is about 635.9001176492.

The spelling of 257138269 in words is "two hundred fifty-seven million, one hundred thirty-eight thousand, two hundred sixty-nine".