31420839 has 4 divisors (see below), whose sum is σ = 41894456. Its totient is φ = 20947224.

The previous prime is 31420817. The next prime is 31420841. The reversal of 31420839 is 93802413.

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

It is not a de Polignac number, because 31420839 - 2⁹ = 31420327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5236804 + ... + 5236809.

It is an arithmetic number, because the mean of its divisors is an integer number (10473614).

Almost surely, 2^31420839 is an apocalyptic number.

31420839 is a deficient number, since it is larger than the sum of its proper divisors (10473617).

31420839 is a wasteful number, since it uses less digits than its factorization.

31420839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10473616.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 31420839 is about 5605.4294215519. The cubic root of 31420839 is about 315.5532027522.

The spelling of 31420839 in words is "thirty-one million, four hundred twenty thousand, eight hundred thirty-nine".