257349139 has 4 divisors (see below), whose sum is σ = 268538256. Its totient is φ = 246160024.

The previous prime is 257349137. The next prime is 257349181. The reversal of 257349139 is 931943752.

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 257349139 - 2¹ = 257349137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257349095 and 257349104.

It is not an unprimeable number, because it can be changed into a prime (257349133) 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, 5594524 + ... + 5594569.

It is an arithmetic number, because the mean of its divisors is an integer number (67134564).

Almost surely, 2^257349139 is an apocalyptic number.

257349139 is a deficient number, since it is larger than the sum of its proper divisors (11189117).

257349139 is a wasteful number, since it uses less digits than its factorization.

257349139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11189116.

The product of its digits is 204120, while the sum is 43.

The square root of 257349139 is about 16042.1051922745. The cubic root of 257349139 is about 636.0738965532.

The spelling of 257349139 in words is "two hundred fifty-seven million, three hundred forty-nine thousand, one hundred thirty-nine".