398976197 has 2 divisors, whose sum is σ = 398976198. Its totient is φ = 398976196.

The previous prime is 398976191. The next prime is 398976199. The reversal of 398976197 is 791679893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390220516 + 8755681 = 19754^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 398976197 - 2⁶ = 398976133 is a prime.

Together with 398976199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398976191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199488098 + 199488099.

It is an arithmetic number, because the mean of its divisors is an integer number (199488099).

Almost surely, 2^398976197 is an apocalyptic number.

It is an amenable number.

398976197 is a deficient number, since it is larger than the sum of its proper divisors (1).

398976197 is an equidigital number, since it uses as much as digits as its factorization.

398976197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5143824, while the sum is 59.

The square root of 398976197 is about 19974.3885263104. The cubic root of 398976197 is about 736.1771422279.

The spelling of 398976197 in words is "three hundred ninety-eight million, nine hundred seventy-six thousand, one hundred ninety-seven".