3990639123 has 16 divisors (see below), whose sum is σ = 6049549440. Its totient is φ = 2598554952.

The previous prime is 3990639053. The next prime is 3990639131. The reversal of 3990639123 is 3219360993.

3990639123 is a `hidden beast` number, since 3 + 9 + 9 + 0 + 639 + 1 + 2 + 3 = 666.

It is not a de Polignac number, because 3990639123 - 2¹² = 3990635027 is a prime.

It is a super-2 number, since 2×3990639123² = 31850401220036418258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3990639223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1717461 + ... + 1719782.

It is an arithmetic number, because the mean of its divisors is an integer number (378096840).

Almost surely, 2^3990639123 is an apocalyptic number.

3990639123 is a deficient number, since it is larger than the sum of its proper divisors (2058910317).

3990639123 is a wasteful number, since it uses less digits than its factorization.

3990639123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437295 (or 3437289 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 45.

The square root of 3990639123 is about 63171.5056255587. The cubic root of 3990639123 is about 1586.1617959215.

The spelling of 3990639123 in words is "three billion, nine hundred ninety million, six hundred thirty-nine thousand, one hundred twenty-three".