31394390 has 16 divisors (see below), whose sum is σ = 56600208. Its totient is φ = 12537696.

The previous prime is 31394387. The next prime is 31394399. The reversal of 31394390 is 9349313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31394399) 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, 5189 + ... + 9471.

It is an arithmetic number, because the mean of its divisors is an integer number (3537513).

Almost surely, 2^31394390 is an apocalyptic number.

31394390 is a deficient number, since it is larger than the sum of its proper divisors (25205818).

31394390 is a wasteful number, since it uses less digits than its factorization.

31394390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5023.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 31394390 is about 5603.0696943729. The cubic root of 31394390 is about 315.4646372244.

The spelling of 31394390 in words is "thirty-one million, three hundred ninety-four thousand, three hundred ninety".