39999938 has 24 divisors (see below), whose sum is σ = 66961776. Its totient is φ = 17903160.

The previous prime is 39999931. The next prime is 39999943. The reversal of 39999938 is 83999993.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (39999931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14981 + ... + 17447.

It is an arithmetic number, because the mean of its divisors is an integer number (2790074).

Almost surely, 2^39999938 is an apocalyptic number.

39999938 is a deficient number, since it is larger than the sum of its proper divisors (26961838).

39999938 is a wasteful number, since it uses less digits than its factorization.

39999938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558 (or 2547 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 59.

The square root of 39999938 is about 6324.5504188045. The cubic root of 39999938 is about 341.9950126377.

The spelling of 39999938 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred thirty-eight".