31993439 has 8 divisors (see below), whose sum is σ = 33925248. Its totient is φ = 30067200.

The previous prime is 31993421. The next prime is 31993441. The reversal of 31993439 is 93439913.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31993439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31993396 and 31993405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31993469) 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, 19634 + ... + 21200.

It is an arithmetic number, because the mean of its divisors is an integer number (4240656).

Almost surely, 2^31993439 is an apocalyptic number.

31993439 is a deficient number, since it is larger than the sum of its proper divisors (1931809).

31993439 is a wasteful number, since it uses less digits than its factorization.

31993439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785.

The product of its digits is 78732, while the sum is 41.

The square root of 31993439 is about 5656.2743038152. The cubic root of 31993439 is about 317.4585111224.

The spelling of 31993439 in words is "thirty-one million, nine hundred ninety-three thousand, four hundred thirty-nine".