257653439 has 2 divisors, whose sum is σ = 257653440. Its totient is φ = 257653438.

The previous prime is 257653421. The next prime is 257653441. The reversal of 257653439 is 934356752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257653439 - 2¹⁶ = 257587903 is a prime.

Together with 257653441, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257653439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257653469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128826719 + 128826720.

It is an arithmetic number, because the mean of its divisors is an integer number (128826720).

Almost surely, 2^257653439 is an apocalyptic number.

257653439 is a deficient number, since it is larger than the sum of its proper divisors (1).

257653439 is an equidigital number, since it uses as much as digits as its factorization.

257653439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 44.

The square root of 257653439 is about 16051.5868062943. The cubic root of 257653439 is about 636.3245042783.

The spelling of 257653439 in words is "two hundred fifty-seven million, six hundred fifty-three thousand, four hundred thirty-nine".