257877379 has 2 divisors, whose sum is σ = 257877380. Its totient is φ = 257877378.

The previous prime is 257877343. The next prime is 257877401. The reversal of 257877379 is 973778752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257877379 - 2²¹ = 255780227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257877479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128938689 + 128938690.

It is an arithmetic number, because the mean of its divisors is an integer number (128938690).

Almost surely, 2^257877379 is an apocalyptic number.

257877379 is a deficient number, since it is larger than the sum of its proper divisors (1).

257877379 is an equidigital number, since it uses as much as digits as its factorization.

257877379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5186160, while the sum is 55.

The square root of 257877379 is about 16058.5609255624. The cubic root of 257877379 is about 636.5088051305.

The spelling of 257877379 in words is "two hundred fifty-seven million, eight hundred seventy-seven thousand, three hundred seventy-nine".