390775437421 has 4 divisors (see below), whose sum is σ = 390776688700. Its totient is φ = 390774186144.

The previous prime is 390775437413. The next prime is 390775437487. The reversal of 390775437421 is 124734577093.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 104384563396 + 286390874025 = 323086^2 + 535155^2 .

It is a cyclic number.

It is not a de Polignac number, because 390775437421 - 2³ = 390775437413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390775434421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274615 + ... + 925723.

It is an arithmetic number, because the mean of its divisors is an integer number (97694172175).

Almost surely, 2^390775437421 is an apocalyptic number.

It is an amenable number.

390775437421 is a deficient number, since it is larger than the sum of its proper divisors (1251279).

390775437421 is an equidigital number, since it uses as much as digits as its factorization.

390775437421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251278.

The product of its (nonzero) digits is 4445280, while the sum is 52.

The spelling of 390775437421 in words is "three hundred ninety billion, seven hundred seventy-five million, four hundred thirty-seven thousand, four hundred twenty-one".