256443797 has 8 divisors (see below), whose sum is σ = 264352896. Its totient is φ = 248636992.

The previous prime is 256443791. The next prime is 256443809. The reversal of 256443797 is 797344652.

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 256443797 - 2²⁰ = 255395221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256443791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20468 + ... + 30525.

It is an arithmetic number, because the mean of its divisors is an integer number (33044112).

Almost surely, 2^256443797 is an apocalyptic number.

It is an amenable number.

256443797 is a deficient number, since it is larger than the sum of its proper divisors (7909099).

256443797 is a wasteful number, since it uses less digits than its factorization.

256443797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51147.

The product of its digits is 1270080, while the sum is 47.

The square root of 256443797 is about 16013.8626508410. The cubic root of 256443797 is about 635.3271276221.

The spelling of 256443797 in words is "two hundred fifty-six million, four hundred forty-three thousand, seven hundred ninety-seven".