3990906 has 12 divisors (see below), whose sum is σ = 8647002. Its totient is φ = 1330296.

The previous prime is 3990901. The next prime is 3990907. The reversal of 3990906 is 6090993.

It can be written as a sum of positive squares in only one way, i.e., 3207681 + 783225 = 1791^2 + 885^2 .

It is not an unprimeable number, because it can be changed into a prime (3990901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110841 + ... + 110876.

Almost surely, 2^3990906 is an apocalyptic number.

3990906 is an abundant number, since it is smaller than the sum of its proper divisors (4656096).

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

3990906 is a wasteful number, since it uses less digits than its factorization.

3990906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221725 (or 221722 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 3990906 is about 1997.7252063284. The cubic root of 3990906 is about 158.6197153722.

The spelling of 3990906 in words is "three million, nine hundred ninety thousand, nine hundred six".