3919638689 has 2 divisors, whose sum is σ = 3919638690. Its totient is φ = 3919638688.

The previous prime is 3919638661. The next prime is 3919638703. The reversal of 3919638689 is 9868369193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3268980625 + 650658064 = 57175^2 + 25508^2 .

It is a cyclic number.

It is not a de Polignac number, because 3919638689 - 2⁸ = 3919638433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3919638389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1959819344 + 1959819345.

It is an arithmetic number, because the mean of its divisors is an integer number (1959819345).

Almost surely, 2^3919638689 is an apocalyptic number.

It is an amenable number.

3919638689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3919638689 is an equidigital number, since it uses as much as digits as its factorization.

3919638689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 62.

The square root of 3919638689 is about 62607.0178893708. The cubic root of 3919638689 is about 1576.6985875912.

The spelling of 3919638689 in words is "three billion, nine hundred nineteen million, six hundred thirty-eight thousand, six hundred eighty-nine".