1321431944 has 64 divisors (see below), whose sum is σ = 2869516800. Its totient is φ = 558802944.

The previous prime is 1321431929. The next prime is 1321431953. The reversal of 1321431944 is 4491341231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321431944.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2322092 + ... + 2322660.

It is an arithmetic number, because the mean of its divisors is an integer number (44836200).

Almost surely, 2^1321431944 is an apocalyptic number.

1321431944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321431944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434758400).

1321431944 is an abundant number, since it is smaller than the sum of its proper divisors (1548084856).

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

1321431944 is a wasteful number, since it uses less digits than its factorization.

1321431944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062 (or 1058 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 1321431944 is about 36351.5053883605. The cubic root of 1321431944 is about 1097.3578305646.

The spelling of 1321431944 in words is "one billion, three hundred twenty-one million, four hundred thirty-one thousand, nine hundred forty-four".