398882173421 has 2 divisors, whose sum is σ = 398882173422. Its totient is φ = 398882173420.

The previous prime is 398882173399. The next prime is 398882173433. The reversal of 398882173421 is 124371288893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392954713321 + 5927460100 = 626861^2 + 76990^2 .

It is a cyclic number.

It is not a de Polignac number, because 398882173421 - 2³⁰ = 397808431597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398882173021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199441086710 + 199441086711.

It is an arithmetic number, because the mean of its divisors is an integer number (199441086711).

Almost surely, 2^398882173421 is an apocalyptic number.

It is an amenable number.

398882173421 is a deficient number, since it is larger than the sum of its proper divisors (1).

398882173421 is an equidigital number, since it uses as much as digits as its factorization.

398882173421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 56.

The spelling of 398882173421 in words is "three hundred ninety-eight billion, eight hundred eighty-two million, one hundred seventy-three thousand, four hundred twenty-one".