3990639131 has 2 divisors, whose sum is σ = 3990639132. Its totient is φ = 3990639130.

The previous prime is 3990639053. The next prime is 3990639157. The reversal of 3990639131 is 1319360993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3990639131 - 2²² = 3986444827 is a prime.

It is a super-2 number, since 2×3990639131² = 31850401347736870322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3990630131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995319565 + 1995319566.

It is an arithmetic number, because the mean of its divisors is an integer number (1995319566).

Almost surely, 2^3990639131 is an apocalyptic number.

3990639131 is a deficient number, since it is larger than the sum of its proper divisors (1).

3990639131 is an equidigital number, since it uses as much as digits as its factorization.

3990639131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 44.

The square root of 3990639131 is about 63171.5056888784. The cubic root of 3990639131 is about 1586.1617969814.

The spelling of 3990639131 in words is "three billion, nine hundred ninety million, six hundred thirty-nine thousand, one hundred thirty-one".