1321280832 has 112 divisors (see below), whose sum is σ = 3631996800. Its totient is φ = 423413760.

The previous prime is 1321280809. The next prime is 1321280897. The reversal of 1321280832 is 2380821231.

It is a super-2 number, since 2×1321280832² = 3491566074021224448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321280832.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1998582 + ... + 1999242.

Almost surely, 2^1321280832 is an apocalyptic number.

1321280832 is a gapful number since it is divisible by the number (12) 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 1321280832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1815998400).

1321280832 is an abundant number, since it is smaller than the sum of its proper divisors (2310715968).

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

1321280832 is a wasteful number, since it uses less digits than its factorization.

1321280832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1321280832 is about 36349.4268455501. The cubic root of 1321280832 is about 1097.3159996153.

The spelling of 1321280832 in words is "one billion, three hundred twenty-one million, two hundred eighty thousand, eight hundred thirty-two".