31939442 has 4 divisors (see below), whose sum is σ = 47909166. Its totient is φ = 15969720.

The previous prime is 31939429. The next prime is 31939477. The reversal of 31939442 is 24493913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24493913 = 443 ⋅55291.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 14055001 = 4229^2 + 3749^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7984859 + ... + 7984862.

Almost surely, 2^31939442 is an apocalyptic number.

31939442 is a deficient number, since it is larger than the sum of its proper divisors (15969724).

31939442 is a wasteful number, since it uses less digits than its factorization.

31939442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15969723.

The product of its digits is 23328, while the sum is 35.

The square root of 31939442 is about 5651.4990931610. The cubic root of 31939442 is about 317.2798134423.

The spelling of 31939442 in words is "thirty-one million, nine hundred thirty-nine thousand, four hundred forty-two".