256673423 has 4 divisors (see below), whose sum is σ = 261023880. Its totient is φ = 252322968.

The previous prime is 256673411. The next prime is 256673441. The reversal of 256673423 is 324376652.

It is a happy number.

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 256673423 - 2⁸ = 256673167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256673453) 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, 2175140 + ... + 2175257.

It is an arithmetic number, because the mean of its divisors is an integer number (65255970).

Almost surely, 2^256673423 is an apocalyptic number.

256673423 is a deficient number, since it is larger than the sum of its proper divisors (4350457).

256673423 is an equidigital number, since it uses as much as digits as its factorization.

256673423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350456.

The product of its digits is 181440, while the sum is 38.

The square root of 256673423 is about 16021.0306472461. The cubic root of 256673423 is about 635.5167001607.

The spelling of 256673423 in words is "two hundred fifty-six million, six hundred seventy-three thousand, four hundred twenty-three".