398165983 has 2 divisors, whose sum is σ = 398165984. Its totient is φ = 398165982.

The previous prime is 398165951. The next prime is 398165987. The reversal of 398165983 is 389561893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398165983 - 2⁵ = 398165951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398165983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398165987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199082991 + 199082992.

It is an arithmetic number, because the mean of its divisors is an integer number (199082992).

Almost surely, 2^398165983 is an apocalyptic number.

398165983 is a deficient number, since it is larger than the sum of its proper divisors (1).

398165983 is an equidigital number, since it uses as much as digits as its factorization.

398165983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 398165983 is about 19954.0968976298. The cubic root of 398165983 is about 735.6784781984.

The spelling of 398165983 in words is "three hundred ninety-eight million, one hundred sixty-five thousand, nine hundred eighty-three".