39999994 has 16 divisors (see below), whose sum is σ = 61300800. Its totient is φ = 19569664.

The previous prime is 39999983. The next prime is 40000003. The reversal of 39999994 is 49999993.

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, 29667 + ... + 30985.

It is an arithmetic number, because the mean of its divisors is an integer number (3831300).

Almost surely, 2^39999994 is an apocalyptic number.

39999994 is a deficient number, since it is larger than the sum of its proper divisors (21300806).

39999994 is a wasteful number, since it uses less digits than its factorization.

39999994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637.

The product of its digits is 6377292, while the sum is 61.

The square root of 39999994 is about 6324.5548459951. The cubic root of 39999994 is about 341.9951722356.

Subtracting 39999994 from its reverse (49999993), we obtain a palindrome (9999999).

The spelling of 39999994 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-four".