256338623 has 2 divisors, whose sum is σ = 256338624. Its totient is φ = 256338622.

The previous prime is 256338619. The next prime is 256338689. The reversal of 256338623 is 326833652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256338623 - 2² = 256338619 is a prime.

It is a super-2 number, since 2×256338623² = 131418979283072258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256338023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128169311 + 128169312.

It is an arithmetic number, because the mean of its divisors is an integer number (128169312).

Almost surely, 2^256338623 is an apocalyptic number.

256338623 is a deficient number, since it is larger than the sum of its proper divisors (1).

256338623 is an equidigital number, since it uses as much as digits as its factorization.

256338623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 38.

The square root of 256338623 is about 16010.5784717480. The cubic root of 256338623 is about 635.2402612430.

The spelling of 256338623 in words is "two hundred fifty-six million, three hundred thirty-eight thousand, six hundred twenty-three".