31089942 has 24 divisors (see below), whose sum is σ = 72543744. Its totient is φ = 9566064.

The previous prime is 31089941. The next prime is 31090021. The reversal of 31089942 is 24998013.

It is a junction number, because it is equal to n+sod(n) for n = 31089897 and 31089906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31089941) 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 11 ways as a sum of consecutive naturals, for example, 66198 + ... + 66665.

It is an arithmetic number, because the mean of its divisors is an integer number (3022656).

Almost surely, 2^31089942 is an apocalyptic number.

31089942 is an abundant number, since it is smaller than the sum of its proper divisors (41453802).

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

31089942 is a wasteful number, since it uses less digits than its factorization.

31089942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132884 (or 132881 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 31089942 is about 5575.8355427685. The cubic root of 31089942 is about 314.4415805581.

The spelling of 31089942 in words is "thirty-one million, eighty-nine thousand, nine hundred forty-two".