31909942 has 4 divisors (see below), whose sum is σ = 47864916. Its totient is φ = 15954970.

The previous prime is 31909937. The next prime is 31909951. The reversal of 31909942 is 24990913.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7977484 + ... + 7977487.

It is an arithmetic number, because the mean of its divisors is an integer number (11966229).

Almost surely, 2^31909942 is an apocalyptic number.

31909942 is a deficient number, since it is larger than the sum of its proper divisors (15954974).

31909942 is a wasteful number, since it uses less digits than its factorization.

31909942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15954973.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 31909942 is about 5648.8885632485. Note that the first 3 decimals coincide. The cubic root of 31909942 is about 317.1821010527.

The spelling of 31909942 in words is "thirty-one million, nine hundred nine thousand, nine hundred forty-two".