398279933 has 2 divisors, whose sum is σ = 398279934. Its totient is φ = 398279932.

The previous prime is 398279887. The next prime is 398279941. The reversal of 398279933 is 339972893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300606244 + 97673689 = 17338^2 + 9883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398279933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398279953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199139966 + 199139967.

It is an arithmetic number, because the mean of its divisors is an integer number (199139967).

Almost surely, 2^398279933 is an apocalyptic number.

It is an amenable number.

398279933 is a deficient number, since it is larger than the sum of its proper divisors (1).

398279933 is an equidigital number, since it uses as much as digits as its factorization.

398279933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 53.

The square root of 398279933 is about 19956.9519967354. The cubic root of 398279933 is about 735.7486520876.

The spelling of 398279933 in words is "three hundred ninety-eight million, two hundred seventy-nine thousand, nine hundred thirty-three".