256406323 has 8 divisors (see below), whose sum is σ = 269510688. Its totient is φ = 243465024.

The previous prime is 256406321. The next prime is 256406399. The reversal of 256406323 is 323604652.

It is a happy number.

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 256406323 - 2¹ = 256406321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256406321) 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, 37536 + ... + 43837.

It is an arithmetic number, because the mean of its divisors is an integer number (33688836).

Almost surely, 2^256406323 is an apocalyptic number.

256406323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

256406323 is a deficient number, since it is larger than the sum of its proper divisors (13104365).

256406323 is a wasteful number, since it uses less digits than its factorization.

256406323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81533.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 256406323 is about 16012.6925593418. The cubic root of 256406323 is about 635.2961794392.

The spelling of 256406323 in words is "two hundred fifty-six million, four hundred six thousand, three hundred twenty-three".