1321856256 has 72 divisors (see below), whose sum is σ = 4020662464. Its totient is φ = 377671680.

The previous prime is 1321856243. The next prime is 1321856273. The reversal of 1321856256 is 6526581231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117565 + ... + 128316.

Almost surely, 2^1321856256 is an apocalyptic number.

1321856256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321856256 is an abundant number, since it is smaller than the sum of its proper divisors (2698806208).

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

1321856256 is an equidigital number, since it uses as much as digits as its factorization.

1321856256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245907 (or 245893 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 1321856256 is about 36357.3411569108. The cubic root of 1321856256 is about 1097.4752719179.

The spelling of 1321856256 in words is "one billion, three hundred twenty-one million, eight hundred fifty-six thousand, two hundred fifty-six".