39431994 has 16 divisors (see below), whose sum is σ = 90130368. Its totient is φ = 11266272.

The previous prime is 39431983. The next prime is 39432007. The reversal of 39431994 is 49913493.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 938857 = 39431994 / (3 + 9 + 4 + 3 + 1 + 9 + 9 + 4).

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, 469387 + ... + 469470.

It is an arithmetic number, because the mean of its divisors is an integer number (5633148).

Almost surely, 2^39431994 is an apocalyptic number.

39431994 is an abundant number, since it is smaller than the sum of its proper divisors (50698374).

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

39431994 is a wasteful number, since it uses less digits than its factorization.

39431994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938869.

The product of its digits is 104976, while the sum is 42.

The square root of 39431994 is about 6279.4899474400. The cubic root of 39431994 is about 340.3686716054.

The spelling of 39431994 in words is "thirty-nine million, four hundred thirty-one thousand, nine hundred ninety-four".