256433423 has 4 divisors (see below), whose sum is σ = 271517760. Its totient is φ = 241349088.

The previous prime is 256433407. The next prime is 256433477. The reversal of 256433423 is 324334652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256433423 - 2⁴ = 256433407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256433423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256433483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7542143 + ... + 7542176.

It is an arithmetic number, because the mean of its divisors is an integer number (67879440).

Almost surely, 2^256433423 is an apocalyptic number.

256433423 is a deficient number, since it is larger than the sum of its proper divisors (15084337).

256433423 is a wasteful number, since it uses less digits than its factorization.

256433423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15084336.

The product of its digits is 51840, while the sum is 32.

The square root of 256433423 is about 16013.5387407031. The cubic root of 256433423 is about 635.3185604785.

The spelling of 256433423 in words is "two hundred fifty-six million, four hundred thirty-three thousand, four hundred twenty-three".