1321596872 has 12 divisors (see below), whose sum is σ = 2478186945. Its totient is φ = 660747024.

The previous prime is 1321596863. The next prime is 1321596907. The reversal of 1321596872 is 2786951231.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1228782916 + 92813956 = 35054^2 + 9634^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25706.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 96398 + ... + 109250.

Almost surely, 2^1321596872 is an apocalyptic number.

It is an amenable number.

1321596872 is a deficient number, since it is larger than the sum of its proper divisors (1156590073).

1321596872 is an frugal number, since it uses more digits than its factorization.

1321596872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25712 (or 12855 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 1321596872 is about 36353.7738343628. The cubic root of 1321596872 is about 1097.4034824308.

The spelling of 1321596872 in words is "one billion, three hundred twenty-one million, five hundred ninety-six thousand, eight hundred seventy-two".