386998706921 has 2 divisors, whose sum is σ = 386998706922. Its totient is φ = 386998706920.

The previous prime is 386998706879. The next prime is 386998706953. The reversal of 386998706921 is 129607899683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317059086400 + 69939620521 = 563080^2 + 264461^2 .

It is a cyclic number.

It is not a de Polignac number, because 386998706921 - 2¹⁰ = 386998705897 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 (386998706021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193499353460 + 193499353461.

It is an arithmetic number, because the mean of its divisors is an integer number (193499353461).

Almost surely, 2^386998706921 is an apocalyptic number.

It is an amenable number.

386998706921 is a deficient number, since it is larger than the sum of its proper divisors (1).

386998706921 is an equidigital number, since it uses as much as digits as its factorization.

386998706921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70543872, while the sum is 68.

The spelling of 386998706921 in words is "three hundred eighty-six billion, nine hundred ninety-eight million, seven hundred six thousand, nine hundred twenty-one".