31393894 has 16 divisors (see below), whose sum is σ = 54701856. Its totient is φ = 13233600.

The previous prime is 31393891. The next prime is 31393927. The reversal of 31393894 is 49839313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31393891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17527 + ... + 19234.

It is an arithmetic number, because the mean of its divisors is an integer number (3418866).

Almost surely, 2^31393894 is an apocalyptic number.

31393894 is a deficient number, since it is larger than the sum of its proper divisors (23307962).

31393894 is a wasteful number, since it uses less digits than its factorization.

31393894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36831.

The product of its digits is 69984, while the sum is 40.

The square root of 31393894 is about 5603.0254327461. The cubic root of 31393894 is about 315.4629758736.

The spelling of 31393894 in words is "thirty-one million, three hundred ninety-three thousand, eight hundred ninety-four".