390736748021 has 2 divisors, whose sum is σ = 390736748022. Its totient is φ = 390736748020.

The previous prime is 390736747937. The next prime is 390736748041. The reversal of 390736748021 is 120847637093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257212279921 + 133524468100 = 507161^2 + 365410^2 .

It is a cyclic number.

It is not a de Polignac number, because 390736748021 - 2¹⁰ = 390736746997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390736748041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195368374010 + 195368374011.

It is an arithmetic number, because the mean of its divisors is an integer number (195368374011).

Almost surely, 2^390736748021 is an apocalyptic number.

It is an amenable number.

390736748021 is a deficient number, since it is larger than the sum of its proper divisors (1).

390736748021 is an equidigital number, since it uses as much as digits as its factorization.

390736748021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 390736748021 in words is "three hundred ninety billion, seven hundred thirty-six million, seven hundred forty-eight thousand, twenty-one".