257384923 has 4 divisors (see below), whose sum is σ = 260643040. Its totient is φ = 254126808.

The previous prime is 257384917. The next prime is 257384957. The reversal of 257384923 is 329483752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257384923 - 2⁵ = 257384891 is a prime.

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 257384923.

It is not an unprimeable number, because it can be changed into a prime (257384903) 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, 1628940 + ... + 1629097.

It is an arithmetic number, because the mean of its divisors is an integer number (65160760).

Almost surely, 2^257384923 is an apocalyptic number.

257384923 is a deficient number, since it is larger than the sum of its proper divisors (3258117).

257384923 is an equidigital number, since it uses as much as digits as its factorization.

257384923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258116.

The product of its digits is 362880, while the sum is 43.

The square root of 257384923 is about 16043.2204684720. The cubic root of 257384923 is about 636.1033768843.

The spelling of 257384923 in words is "two hundred fifty-seven million, three hundred eighty-four thousand, nine hundred twenty-three".