31379839 has 4 divisors (see below), whose sum is σ = 31403520. Its totient is φ = 31356160.

The previous prime is 31379837. The next prime is 31379861. The reversal of 31379839 is 93897313.

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

It is a cyclic number.

It is not a de Polignac number, because 31379839 - 2¹ = 31379837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31379795 and 31379804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31379833) 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, 9727 + ... + 12544.

It is an arithmetic number, because the mean of its divisors is an integer number (7850880).

Almost surely, 2^31379839 is an apocalyptic number.

31379839 is a deficient number, since it is larger than the sum of its proper divisors (23681).

31379839 is a wasteful number, since it uses less digits than its factorization.

31379839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23680.

The product of its digits is 122472, while the sum is 43.

The square root of 31379839 is about 5601.7710592276. The cubic root of 31379839 is about 315.4158914101.

The spelling of 31379839 in words is "thirty-one million, three hundred seventy-nine thousand, eight hundred thirty-nine".