31389946 has 16 divisors (see below), whose sum is σ = 54051840. Its totient is φ = 13392720.

The previous prime is 31389923. The next prime is 31389961. The reversal of 31389946 is 64998313.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1690 + ... + 8101.

It is an arithmetic number, because the mean of its divisors is an integer number (3378240).

Almost surely, 2^31389946 is an apocalyptic number.

31389946 is a deficient number, since it is larger than the sum of its proper divisors (22661894).

31389946 is a wasteful number, since it uses less digits than its factorization.

31389946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10029.

The product of its digits is 139968, while the sum is 43.

The square root of 31389946 is about 5602.6731120064. The cubic root of 31389946 is about 315.4497514332.

The spelling of 31389946 in words is "thirty-one million, three hundred eighty-nine thousand, nine hundred forty-six".