3990639122 has 18 divisors (see below), whose sum is σ = 6320279079. Its totient is φ = 1889498700.

The previous prime is 3990639053. The next prime is 3990639131. The reversal of 3990639122 is 2219360993.

3990639122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1995319561 + 1995319561 = 44669^2 + 44669^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=44669.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1696247 + ... + 1698597.

Almost surely, 2^3990639122 is an apocalyptic number.

3990639122 is a deficient number, since it is larger than the sum of its proper divisors (2329639957).

3990639122 is an frugal number, since it uses more digits than its factorization.

3990639122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742 (or 2372 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 3990639122 is about 63171.5056176438. The cubic root of 3990639122 is about 1586.1617957890.

The spelling of 3990639122 in words is "three billion, nine hundred ninety million, six hundred thirty-nine thousand, one hundred twenty-two".