3990558906 has 16 divisors (see below), whose sum is σ = 8867908800. Its totient is φ = 1330186284.

The previous prime is 3990558899. The next prime is 3990558941. The reversal of 3990558906 is 6098550993.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 73899239 = 3990558906 / (3 + 9 + 9 + 0 + 5 + 5 + 8 + 9 + 0 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36949566 + ... + 36949673.

It is an arithmetic number, because the mean of its divisors is an integer number (554244300).

Almost surely, 2^3990558906 is an apocalyptic number.

3990558906 is an abundant number, since it is smaller than the sum of its proper divisors (4877349894).

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

3990558906 is a wasteful number, since it uses less digits than its factorization.

3990558906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73899250 (or 73899244 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The square root of 3990558906 is about 63170.8707079458. The cubic root of 3990558906 is about 1586.1511678834.

The spelling of 3990558906 in words is "three billion, nine hundred ninety million, five hundred fifty-eight thousand, nine hundred six".