398882179957 has 2 divisors, whose sum is σ = 398882179958. Its totient is φ = 398882179956.

The previous prime is 398882179933. The next prime is 398882179963. The reversal of 398882179957 is 759971288893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244946796241 + 153935383716 = 494921^2 + 392346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398882179957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398882179907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199441089978 + 199441089979.

It is an arithmetic number, because the mean of its divisors is an integer number (199441089979).

Almost surely, 2^398882179957 is an apocalyptic number.

It is an amenable number.

398882179957 is a deficient number, since it is larger than the sum of its proper divisors (1).

398882179957 is an equidigital number, since it uses as much as digits as its factorization.

398882179957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 548674560, while the sum is 76.

The spelling of 398882179957 in words is "three hundred ninety-eight billion, eight hundred eighty-two million, one hundred seventy-nine thousand, nine hundred fifty-seven".