256374999 has 24 divisors (see below), whose sum is σ = 390648960. Its totient is φ = 161572752.

The previous prime is 256374973. The next prime is 256375013. The reversal of 256374999 is 999473652.

256374999 is a `hidden beast` number, since 2 + 563 + 74 + 9 + 9 + 9 = 666.

It is not a de Polignac number, because 256374999 - 2⁵ = 256374967 is a prime.

It is a super-2 number, since 2×256374999² = 131456280224500002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256374499) 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 in 23 ways as a sum of consecutive naturals, for example, 94942 + ... + 97604.

It is an arithmetic number, because the mean of its divisors is an integer number (16277040).

Almost surely, 2^256374999 is an apocalyptic number.

256374999 is a deficient number, since it is larger than the sum of its proper divisors (134273961).

256374999 is a wasteful number, since it uses less digits than its factorization.

256374999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251 (or 3248 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 256374999 is about 16011.7144303788. The cubic root of 256374999 is about 635.2703079660.

The spelling of 256374999 in words is "two hundred fifty-six million, three hundred seventy-four thousand, nine hundred ninety-nine".