1320972639 has 48 divisors (see below), whose sum is σ = 2131395072. Its totient is φ = 711526464.

The previous prime is 1320972623. The next prime is 1320972643. The reversal of 1320972639 is 9362790231.

It is not a de Polignac number, because 1320972639 - 2⁴ = 1320972623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320972639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320972619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3327189 + ... + 3327585.

It is an arithmetic number, because the mean of its divisors is an integer number (44404064).

Almost surely, 2^1320972639 is an apocalyptic number.

1320972639 is a deficient number, since it is larger than the sum of its proper divisors (810422433).

1320972639 is an equidigital number, since it uses as much as digits as its factorization.

1320972639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 1320972639 is about 36345.1872880028. The cubic root of 1320972639 is about 1097.2306754865.

The spelling of 1320972639 in words is "one billion, three hundred twenty million, nine hundred seventy-two thousand, six hundred thirty-nine".