1320972638 has 8 divisors (see below), whose sum is σ = 1981703232. Its totient is φ = 660404896.

The previous prime is 1320972623. The next prime is 1320972643. The reversal of 1320972638 is 8362790231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1320972595 and 1320972604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17870 + ... + 54417.

It is an arithmetic number, because the mean of its divisors is an integer number (247712904).

Almost surely, 2^1320972638 is an apocalyptic number.

1320972638 is a deficient number, since it is larger than the sum of its proper divisors (660730594).

1320972638 is an equidigital number, since it uses as much as digits as its factorization.

1320972638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81426.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 1320972638 is about 36345.1872742458. The cubic root of 1320972638 is about 1097.2306752097.

The spelling of 1320972638 in words is "one billion, three hundred twenty million, nine hundred seventy-two thousand, six hundred thirty-eight".