39929904 has 90 divisors (see below), whose sum is σ = 130015860. Its totient is φ = 11406528.

The previous prime is 39929899. The next prime is 39929927. The reversal of 39929904 is 40992993.

It is a self number, because there is not a number n which added to its sum of digits gives 39929904.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4227 + ... + 9885.

Almost surely, 2^39929904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39929904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65007930).

39929904 is an abundant number, since it is smaller than the sum of its proper divisors (90085956).

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

39929904 is a wasteful number, since it uses less digits than its factorization.

39929904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5687 (or 5671 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 39929904 is about 6319.0113150714. The cubic root of 39929904 is about 341.7953017389.

It can be divided in two parts, 399 and 29904, that added together give a palindrome (30303).

The spelling of 39929904 in words is "thirty-nine million, nine hundred twenty-nine thousand, nine hundred four".