31339427 has 4 divisors (see below), whose sum is σ = 35816496. Its totient is φ = 26862360.

The previous prime is 31339423. The next prime is 31339453. The reversal of 31339427 is 72493313.

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

It is not a de Polignac number, because 31339427 - 2² = 31339423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31339393 and 31339402.

It is not an unprimeable number, because it can be changed into a prime (31339423) 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, 2238524 + ... + 2238537.

It is an arithmetic number, because the mean of its divisors is an integer number (8954124).

Almost surely, 2^31339427 is an apocalyptic number.

31339427 is a deficient number, since it is larger than the sum of its proper divisors (4477069).

31339427 is an equidigital number, since it uses as much as digits as its factorization.

31339427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4477068.

The product of its digits is 13608, while the sum is 32.

The square root of 31339427 is about 5598.1628236413. The cubic root of 31339427 is about 315.2804322198.

The spelling of 31339427 in words is "thirty-one million, three hundred thirty-nine thousand, four hundred twenty-seven".