256667339 has 4 divisors (see below), whose sum is σ = 262927560. Its totient is φ = 250407120.

The previous prime is 256667303. The next prime is 256667347. The reversal of 256667339 is 933766652.

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 256667339 - 2¹² = 256663243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256667293 and 256667302.

It is not an unprimeable number, because it can be changed into a prime (256667399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3130049 + ... + 3130130.

It is an arithmetic number, because the mean of its divisors is an integer number (65731890).

Almost surely, 2^256667339 is an apocalyptic number.

256667339 is a deficient number, since it is larger than the sum of its proper divisors (6260221).

256667339 is an equidigital number, since it uses as much as digits as its factorization.

256667339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6260220.

The product of its digits is 1224720, while the sum is 47.

The square root of 256667339 is about 16020.8407706961. The cubic root of 256667339 is about 635.5116788460.

The spelling of 256667339 in words is "two hundred fifty-six million, six hundred sixty-seven thousand, three hundred thirty-nine".