1321982772 has 48 divisors (see below), whose sum is σ = 3367224000. Its totient is φ = 400341760.

The previous prime is 1321982759. The next prime is 1321982791. The reversal of 1321982772 is 2772891231.

It is a congruent number.

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, 334504 + ... + 338432.

It is an arithmetic number, because the mean of its divisors is an integer number (70150500).

Almost surely, 2^1321982772 is an apocalyptic number.

1321982772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321982772 is an abundant number, since it is smaller than the sum of its proper divisors (2045241228).

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

1321982772 is a wasteful number, since it uses less digits than its factorization.

1321982772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6496 (or 6494 counting only the distinct ones).

The product of its digits is 84672, while the sum is 42.

The square root of 1321982772 is about 36359.0810114887. The cubic root of 1321982772 is about 1097.5102842352.

The spelling of 1321982772 in words is "one billion, three hundred twenty-one million, nine hundred eighty-two thousand, seven hundred seventy-two".