3879669721 has 2 divisors, whose sum is σ = 3879669722. Its totient is φ = 3879669720.

The previous prime is 3879669691. The next prime is 3879669733. The reversal of 3879669721 is 1279669783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2067975625 + 1811694096 = 45475^2 + 42564^2 .

It is a cyclic number.

It is not a de Polignac number, because 3879669721 - 2⁷ = 3879669593 is a prime.

It is not a weakly prime, because it can be changed into another prime (3879669751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1939834860 + 1939834861.

It is an arithmetic number, because the mean of its divisors is an integer number (1939834861).

Almost surely, 2^3879669721 is an apocalyptic number.

It is an amenable number.

3879669721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3879669721 is an equidigital number, since it uses as much as digits as its factorization.

3879669721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 58.

The square root of 3879669721 is about 62286.9947982723. The cubic root of 3879669721 is about 1571.3210136155.

The spelling of 3879669721 in words is "three billion, eight hundred seventy-nine million, six hundred sixty-nine thousand, seven hundred twenty-one".