257672339 has 2 divisors, whose sum is σ = 257672340. Its totient is φ = 257672338.

The previous prime is 257672323. The next prime is 257672369. The reversal of 257672339 is 933276752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257672339 - 2⁴ = 257672323 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257672339.

It is not a weakly prime, because it can be changed into another prime (257672309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128836169 + 128836170.

It is an arithmetic number, because the mean of its divisors is an integer number (128836170).

Almost surely, 2^257672339 is an apocalyptic number.

257672339 is a deficient number, since it is larger than the sum of its proper divisors (1).

257672339 is an equidigital number, since it uses as much as digits as its factorization.

257672339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 44.

The square root of 257672339 is about 16052.1755223396. The cubic root of 257672339 is about 636.3400629542.

The spelling of 257672339 in words is "two hundred fifty-seven million, six hundred seventy-two thousand, three hundred thirty-nine".