398882797421 has 2 divisors, whose sum is σ = 398882797422. Its totient is φ = 398882797420.

The previous prime is 398882797387. The next prime is 398882797499. The reversal of 398882797421 is 124797288893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347586889225 + 51295908196 = 589565^2 + 226486^2 .

It is a cyclic number.

It is not a de Polignac number, because 398882797421 - 2¹⁸ = 398882535277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398882790421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199441398710 + 199441398711.

It is an arithmetic number, because the mean of its divisors is an integer number (199441398711).

Almost surely, 2^398882797421 is an apocalyptic number.

It is an amenable number.

398882797421 is a deficient number, since it is larger than the sum of its proper divisors (1).

398882797421 is an equidigital number, since it uses as much as digits as its factorization.

398882797421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97542144, while the sum is 68.

The spelling of 398882797421 in words is "three hundred ninety-eight billion, eight hundred eighty-two million, seven hundred ninety-seven thousand, four hundred twenty-one".