257394839 has 8 divisors (see below), whose sum is σ = 277372032. Its totient is φ = 237443040.

The previous prime is 257394827. The next prime is 257394857. The reversal of 257394839 is 938493752.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257394839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257394859) 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, 18269 + ... + 29129.

It is an arithmetic number, because the mean of its divisors is an integer number (34671504).

Almost surely, 2^257394839 is an apocalyptic number.

257394839 is a deficient number, since it is larger than the sum of its proper divisors (19977193).

257394839 is a wasteful number, since it uses less digits than its factorization.

257394839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12697.

The product of its digits is 1632960, while the sum is 50.

The square root of 257394839 is about 16043.5295056917. The cubic root of 257394839 is about 636.1115456094. Note that the first 3 decimals are identical.

The spelling of 257394839 in words is "two hundred fifty-seven million, three hundred ninety-four thousand, eight hundred thirty-nine".