257295823 has 4 divisors (see below), whose sum is σ = 257327928. Its totient is φ = 257263720.

The previous prime is 257295821. The next prime is 257295847. The reversal of 257295823 is 328592752.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 257295823 - 2¹ = 257295821 is a prime.

It is a super-2 number, since 2×257295823² = 132402281066494658, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257295823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257295821) 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, 7113 + ... + 23773.

It is an arithmetic number, because the mean of its divisors is an integer number (64331982).

Almost surely, 2^257295823 is an apocalyptic number.

257295823 is a deficient number, since it is larger than the sum of its proper divisors (32105).

257295823 is a wasteful number, since it uses less digits than its factorization.

257295823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32104.

The product of its digits is 302400, while the sum is 43.

The square root of 257295823 is about 16040.4433542219. The cubic root of 257295823 is about 636.0299675699.

The spelling of 257295823 in words is "two hundred fifty-seven million, two hundred ninety-five thousand, eight hundred twenty-three".