3986399531 has 2 divisors, whose sum is σ = 3986399532. Its totient is φ = 3986399530.

The previous prime is 3986399497. The next prime is 3986399539. The reversal of 3986399531 is 1359936893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3986399531 - 2⁶ = 3986399467 is a prime.

It is a super-2 number, since 2×3986399531² = 31782762441514039922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3986399539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993199765 + 1993199766.

It is an arithmetic number, because the mean of its divisors is an integer number (1993199766).

Almost surely, 2^3986399531 is an apocalyptic number.

3986399531 is a deficient number, since it is larger than the sum of its proper divisors (1).

3986399531 is an equidigital number, since it uses as much as digits as its factorization.

3986399531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4723920, while the sum is 56.

The square root of 3986399531 is about 63137.9405033139. The cubic root of 3986399531 is about 1585.5998924722.

The spelling of 3986399531 in words is "three billion, nine hundred eighty-six million, three hundred ninety-nine thousand, five hundred thirty-one".