256239367 has 2 divisors, whose sum is σ = 256239368. Its totient is φ = 256239366.

The previous prime is 256239359. The next prime is 256239407. The reversal of 256239367 is 763932652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256239367 - 2³ = 256239359 is a prime.

It is a super-3 number, since 3×256239367³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256239337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128119683 + 128119684.

It is an arithmetic number, because the mean of its divisors is an integer number (128119684).

Almost surely, 2^256239367 is an apocalyptic number.

256239367 is a deficient number, since it is larger than the sum of its proper divisors (1).

256239367 is an equidigital number, since it uses as much as digits as its factorization.

256239367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 43.

The square root of 256239367 is about 16007.4784710147. The cubic root of 256239367 is about 635.1582609233.

The spelling of 256239367 in words is "two hundred fifty-six million, two hundred thirty-nine thousand, three hundred sixty-seven".