256538723 has 8 divisors (see below), whose sum is σ = 301111392. Its totient is φ = 213947136.

The previous prime is 256538699. The next prime is 256538747. The reversal of 256538723 is 327835652.

It is an interprime number because it is at equal distance from previous prime (256538699) and next prime (256538747).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256538723 - 2⁸ = 256538467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256538753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494990 + ... + 495507.

It is an arithmetic number, because the mean of its divisors is an integer number (37638924).

Almost surely, 2^256538723 is an apocalyptic number.

256538723 is a deficient number, since it is larger than the sum of its proper divisors (44572669).

256538723 is an equidigital number, since it uses as much as digits as its factorization.

256538723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990541.

The product of its digits is 302400, while the sum is 41.

The square root of 256538723 is about 16016.8262461700. The cubic root of 256538723 is about 635.4055094790.

The spelling of 256538723 in words is "two hundred fifty-six million, five hundred thirty-eight thousand, seven hundred twenty-three".