39931994 has 4 divisors (see below), whose sum is σ = 59897994. Its totient is φ = 19965996.

The previous prime is 39931987. The next prime is 39932023. The reversal of 39931994 is 49913993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49913993 = 631 ⋅79103.

It can be written as a sum of positive squares in only one way, i.e., 32341969 + 7590025 = 5687^2 + 2755^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9982997 + ... + 9983000.

Almost surely, 2^39931994 is an apocalyptic number.

39931994 is a deficient number, since it is larger than the sum of its proper divisors (19966000).

39931994 is a wasteful number, since it uses less digits than its factorization.

39931994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19965999.

The product of its digits is 236196, while the sum is 47.

The square root of 39931994 is about 6319.1766868794. The cubic root of 39931994 is about 341.8012650199.

The spelling of 39931994 in words is "thirty-nine million, nine hundred thirty-one thousand, nine hundred ninety-four".