3869768621 has 2 divisors, whose sum is σ = 3869768622. Its totient is φ = 3869768620.

The previous prime is 3869768611. The next prime is 3869768629. The reversal of 3869768621 is 1268679683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2700880900 + 1168887721 = 51970^2 + 34189^2 .

It is an emirp because it is prime and its reverse (1268679683) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3869768621 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3869768629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1934884310 + 1934884311.

It is an arithmetic number, because the mean of its divisors is an integer number (1934884311).

Almost surely, 2^3869768621 is an apocalyptic number.

It is an amenable number.

3869768621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3869768621 is an equidigital number, since it uses as much as digits as its factorization.

3869768621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 56.

The square root of 3869768621 is about 62207.4643511532. The cubic root of 3869768621 is about 1569.9831798001.

The spelling of 3869768621 in words is "three billion, eight hundred sixty-nine million, seven hundred sixty-eight thousand, six hundred twenty-one".