31439394 has 64 divisors (see below), whose sum is σ = 82452480. Its totient is φ = 8689680.

The previous prime is 31439383. The next prime is 31439399. The reversal of 31439394 is 49393413.

It is not an unprimeable number, because it can be changed into a prime (31439399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10377 + ... + 13059.

It is an arithmetic number, because the mean of its divisors is an integer number (1288320).

Almost surely, 2^31439394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31439394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41226240).

31439394 is an abundant number, since it is smaller than the sum of its proper divisors (51013086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31439394 is a wasteful number, since it uses less digits than its factorization.

31439394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732 (or 2726 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 31439394 is about 5607.0842690297. The cubic root of 31439394 is about 315.6153052474.

The spelling of 31439394 in words is "thirty-one million, four hundred thirty-nine thousand, three hundred ninety-four".