398826082621 has 2 divisors, whose sum is σ = 398826082622. Its totient is φ = 398826082620.

The previous prime is 398826082601. The next prime is 398826082661. The reversal of 398826082621 is 126280628893.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272473560100 + 126352522521 = 521990^2 + 355461^2 .

It is a cyclic number.

It is not a de Polignac number, because 398826082621 - 2²³ = 398817694013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398826082601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199413041310 + 199413041311.

It is an arithmetic number, because the mean of its divisors is an integer number (199413041311).

Almost surely, 2^398826082621 is an apocalyptic number.

It is an amenable number.

398826082621 is a deficient number, since it is larger than the sum of its proper divisors (1).

398826082621 is an equidigital number, since it uses as much as digits as its factorization.

398826082621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 398826082621 in words is "three hundred ninety-eight billion, eight hundred twenty-six million, eighty-two thousand, six hundred twenty-one".