256243692 has 18 divisors (see below), whose sum is σ = 598031364. Its totient is φ = 85396080.

The previous prime is 256243657. The next prime is 256243693. The reversal of 256243692 is 296342652.

It is a self number, because there is not a number n which added to its sum of digits gives 256243692.

It is not an unprimeable number, because it can be changed into a prime (256243693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53142 + ... + 57762.

Almost surely, 2^256243692 is an apocalyptic number.

It is an amenable number.

256243692 is an abundant number, since it is smaller than the sum of its proper divisors (341787672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256243692 is an frugal number, since it uses more digits than its factorization.

256243692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9249 (or 4626 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 256243692 is about 16007.6135635516. The cubic root of 256243692 is about 635.1618344622.

The spelling of 256243692 in words is "two hundred fifty-six million, two hundred forty-three thousand, six hundred ninety-two".