3974985689 has 2 divisors, whose sum is σ = 3974985690. Its totient is φ = 3974985688.

The previous prime is 3974985683. The next prime is 3974985709. The reversal of 3974985689 is 9865894793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3709784464 + 265201225 = 60908^2 + 16285^2 .

It is a cyclic number.

It is not a de Polignac number, because 3974985689 - 2⁴ = 3974985673 is a prime.

It is a super-2 number, since 2×3974985689² = 31601022455509609442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3974985683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1987492844 + 1987492845.

It is an arithmetic number, because the mean of its divisors is an integer number (1987492845).

Almost surely, 2^3974985689 is an apocalyptic number.

It is an amenable number.

3974985689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3974985689 is an equidigital number, since it uses as much as digits as its factorization.

3974985689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117573120, while the sum is 68.

The square root of 3974985689 is about 63047.4875708779. The cubic root of 3974985689 is about 1584.0851516193.

The spelling of 3974985689 in words is "three billion, nine hundred seventy-four million, nine hundred eighty-five thousand, six hundred eighty-nine".