39918906 has 60 divisors (see below), whose sum is σ = 92954862. Its totient is φ = 12803616.

The previous prime is 39918889. The next prime is 39918919. The reversal of 39918906 is 60981993.

It can be written as a sum of positive squares in 3 ways, for example, as 39576681 + 342225 = 6291^2 + 585^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 136096 + ... + 136388.

Almost surely, 2^39918906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39918906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46477431).

39918906 is an abundant number, since it is smaller than the sum of its proper divisors (53035956).

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

39918906 is a wasteful number, since it uses less digits than its factorization.

39918906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 39918906 is about 6318.1410240671. The cubic root of 39918906 is about 341.7639183267.

The spelling of 39918906 in words is "thirty-nine million, nine hundred eighteen thousand, nine hundred six".