390105745921 has 2 divisors, whose sum is σ = 390105745922. Its totient is φ = 390105745920.

The previous prime is 390105745879. The next prime is 390105745963. The reversal of 390105745921 is 129547501093.

It is a balanced prime because it is at equal distance from previous prime (390105745879) and next prime (390105745963).

It can be written as a sum of positive squares in only one way, i.e., 386635240000 + 3470505921 = 621800^2 + 58911^2 .

It is a cyclic number.

It is not a de Polignac number, because 390105745921 - 2¹⁹ = 390105221633 is a prime.

It is not a weakly prime, because it can be changed into another prime (390105745621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195052872960 + 195052872961.

It is an arithmetic number, because the mean of its divisors is an integer number (195052872961).

Almost surely, 2^390105745921 is an apocalyptic number.

It is an amenable number.

390105745921 is a deficient number, since it is larger than the sum of its proper divisors (1).

390105745921 is an equidigital number, since it uses as much as digits as its factorization.

390105745921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 46.

The spelling of 390105745921 in words is "three hundred ninety billion, one hundred five million, seven hundred forty-five thousand, nine hundred twenty-one".