31920379 has 4 divisors (see below), whose sum is σ = 32599584. Its totient is φ = 31241176.

The previous prime is 31920367. The next prime is 31920391. The reversal of 31920379 is 97302913.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (31920367) and next prime (31920391).

It is a cyclic number.

It is not a de Polignac number, because 31920379 - 2¹³ = 31912187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31920349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339532 + ... + 339625.

It is an arithmetic number, because the mean of its divisors is an integer number (8149896).

Almost surely, 2^31920379 is an apocalyptic number.

31920379 is a deficient number, since it is larger than the sum of its proper divisors (679205).

31920379 is an equidigital number, since it uses as much as digits as its factorization.

31920379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679204.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 31920379 is about 5649.8122977671. The cubic root of 31920379 is about 317.2166782463.

The spelling of 31920379 in words is "thirty-one million, nine hundred twenty thousand, three hundred seventy-nine".