398632393 has 2 divisors, whose sum is σ = 398632394. Its totient is φ = 398632392.

The previous prime is 398632391. The next prime is 398632447. The reversal of 398632393 is 393236893.

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., 330948864 + 67683529 = 18192^2 + 8227^2 .

It is a cyclic number.

It is not a de Polignac number, because 398632393 - 2¹ = 398632391 is a prime.

Together with 398632391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (398632391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199316196 + 199316197.

It is an arithmetic number, because the mean of its divisors is an integer number (199316197).

Almost surely, 2^398632393 is an apocalyptic number.

It is an amenable number.

398632393 is a deficient number, since it is larger than the sum of its proper divisors (1).

398632393 is an equidigital number, since it uses as much as digits as its factorization.

398632393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 46.

The square root of 398632393 is about 19965.7805507323. The cubic root of 398632393 is about 735.9656230251.

The spelling of 398632393 in words is "three hundred ninety-eight million, six hundred thirty-two thousand, three hundred ninety-three".