256055393 has 4 divisors (see below), whose sum is σ = 279333168. Its totient is φ = 232777620.

The previous prime is 256055341. The next prime is 256055407. The reversal of 256055393 is 393550652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256055393 - 2¹⁴ = 256039009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256055333) 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, 11638871 + ... + 11638892.

It is an arithmetic number, because the mean of its divisors is an integer number (69833292).

Almost surely, 2^256055393 is an apocalyptic number.

It is an amenable number.

256055393 is a deficient number, since it is larger than the sum of its proper divisors (23277775).

256055393 is a wasteful number, since it uses less digits than its factorization.

256055393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23277774.

The product of its (nonzero) digits is 121500, while the sum is 38.

The square root of 256055393 is about 16001.7309376205. The cubic root of 256055393 is about 635.0062148316.

The spelling of 256055393 in words is "two hundred fifty-six million, fifty-five thousand, three hundred ninety-three".