3989669891 has 2 divisors, whose sum is σ = 3989669892. Its totient is φ = 3989669890.

The previous prime is 3989669833. The next prime is 3989669909. The reversal of 3989669891 is 1989669893.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3989669891 is a prime.

It is not a weakly prime, because it can be changed into another prime (3989699891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994834945 + 1994834946.

It is an arithmetic number, because the mean of its divisors is an integer number (1994834946).

Almost surely, 2^3989669891 is an apocalyptic number.

3989669891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989669891 is an equidigital number, since it uses as much as digits as its factorization.

3989669891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45349632, while the sum is 68.

The square root of 3989669891 is about 63163.8337262709. The cubic root of 3989669891 is about 1586.0333717767.

The spelling of 3989669891 in words is "three billion, nine hundred eighty-nine million, six hundred sixty-nine thousand, eight hundred ninety-one".