39949994 has 24 divisors (see below), whose sum is σ = 72117540. Its totient is φ = 16529856.

The previous prime is 39949993. The next prime is 39949999. The reversal of 39949994 is 49994993.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36663025 + 3286969 = 6055^2 + 1813^2 .

It is not an unprimeable number, because it can be changed into a prime (39949993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4187 + ... + 9870.

Almost surely, 2^39949994 is an apocalyptic number.

39949994 is a deficient number, since it is larger than the sum of its proper divisors (32167546).

39949994 is a wasteful number, since it uses less digits than its factorization.

39949994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14102 (or 14095 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 56.

The square root of 39949994 is about 6320.6007625858. The cubic root of 39949994 is about 341.8526148103.

The spelling of 39949994 in words is "thirty-nine million, nine hundred forty-nine thousand, nine hundred ninety-four".