256990923 has 12 divisors (see below), whose sum is σ = 424239088. Its totient is φ = 146851920.

The previous prime is 256990913. The next prime is 256990933. The reversal of 256990923 is 329099652.

It is an interprime number because it is at equal distance from previous prime (256990913) and next prime (256990933).

It is not a de Polignac number, because 256990923 - 2⁴ = 256990907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256990913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2039548 + ... + 2039673.

Almost surely, 2^256990923 is an apocalyptic number.

256990923 is a deficient number, since it is larger than the sum of its proper divisors (167248165).

256990923 is a wasteful number, since it uses less digits than its factorization.

256990923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079234 (or 4079231 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 256990923 is about 16030.9364355299. The cubic root of 256990923 is about 635.7786327613.

The spelling of 256990923 in words is "two hundred fifty-six million, nine hundred ninety thousand, nine hundred twenty-three".