3990689929 has 2 divisors, whose sum is σ = 3990689930. Its totient is φ = 3990689928.

The previous prime is 3990689921. The next prime is 3990689933. The reversal of 3990689929 is 9299860993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2083009600 + 1907680329 = 45640^2 + 43677^2 .

It is an emirp because it is prime and its reverse (9299860993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3990689929 - 2³ = 3990689921 is a prime.

It is a super-2 number, since 2×3990689929² = 31851212218844050082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3990689921) 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 as a sum of consecutive naturals, namely, 1995344964 + 1995344965.

It is an arithmetic number, because the mean of its divisors is an integer number (1995344965).

Almost surely, 2^3990689929 is an apocalyptic number.

It is an amenable number.

3990689929 is a deficient number, since it is larger than the sum of its proper divisors (1).

3990689929 is an equidigital number, since it uses as much as digits as its factorization.

3990689929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17006112, while the sum is 64.

The square root of 3990689929 is about 63171.9077517847. The cubic root of 3990689929 is about 1586.1685271903.

The spelling of 3990689929 in words is "three billion, nine hundred ninety million, six hundred eighty-nine thousand, nine hundred twenty-nine".