256754993 has 4 divisors (see below), whose sum is σ = 280096368. Its totient is φ = 233413620.

The previous prime is 256754987. The next prime is 256755007. The reversal of 256754993 is 399457652.

It is a happy number.

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 not a de Polignac number, because 256754993 - 2¹⁴ = 256738609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256754963) 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, 11670671 + ... + 11670692.

It is an arithmetic number, because the mean of its divisors is an integer number (70024092).

Almost surely, 2^256754993 is an apocalyptic number.

It is an amenable number.

256754993 is a deficient number, since it is larger than the sum of its proper divisors (23341375).

256754993 is a wasteful number, since it uses less digits than its factorization.

256754993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23341374.

The product of its digits is 2041200, while the sum is 50.

The square root of 256754993 is about 16023.5761613942. The cubic root of 256754993 is about 635.5840147612.

The spelling of 256754993 in words is "two hundred fifty-six million, seven hundred fifty-four thousand, nine hundred ninety-three".