31479639 has 8 divisors (see below), whose sum is σ = 41999232. Its totient is φ = 20973240.

The previous prime is 31479619. The next prime is 31479647. The reversal of 31479639 is 93697413.

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

It is not a de Polignac number, because 31479639 - 2⁹ = 31479127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31479639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31479619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6094 + ... + 10004.

It is an arithmetic number, because the mean of its divisors is an integer number (5249904).

Almost surely, 2^31479639 is an apocalyptic number.

31479639 is a deficient number, since it is larger than the sum of its proper divisors (10519593).

31479639 is a wasteful number, since it uses less digits than its factorization.

31479639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6597.

The product of its digits is 122472, while the sum is 42.

The square root of 31479639 is about 5610.6718848993. The cubic root of 31479639 is about 315.7499189741.

The spelling of 31479639 in words is "thirty-one million, four hundred seventy-nine thousand, six hundred thirty-nine".