398023 has 2 divisors, whose sum is σ = 398024. Its totient is φ = 398022.

The previous prime is 398011. The next prime is 398029. The reversal of 398023 is 320893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199011 + 199012.

It is an arithmetic number, because the mean of its divisors is an integer number (199012).

2³⁹⁸⁰²³ is an apocalyptic number.

398023 is a deficient number, since it is larger than the sum of its proper divisors (1).

398023 is an equidigital number, since it uses as much as digits as its factorization.

398023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 398023 is about 630.8906402856. The cubic root of 398023 is about 73.5590405959.

The spelling of 398023 in words is "three hundred ninety-eight thousand, twenty-three".