256738723 has 2 divisors, whose sum is σ = 256738724. Its totient is φ = 256738722.

The previous prime is 256738717. The next prime is 256738733. The reversal of 256738723 is 327837652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256738723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256738723.

It is not a weakly prime, because it can be changed into another prime (256738733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128369361 + 128369362.

It is an arithmetic number, because the mean of its divisors is an integer number (128369362).

Almost surely, 2^256738723 is an apocalyptic number.

256738723 is a deficient number, since it is larger than the sum of its proper divisors (1).

256738723 is an equidigital number, since it uses as much as digits as its factorization.

256738723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 43.

The square root of 256738723 is about 16023.0684639366. The cubic root of 256738723 is about 635.5705892899.

The spelling of 256738723 in words is "two hundred fifty-six million, seven hundred thirty-eight thousand, seven hundred twenty-three".