398287231 has 2 divisors, whose sum is σ = 398287232. Its totient is φ = 398287230.

The previous prime is 398287207. The next prime is 398287249. The reversal of 398287231 is 132782893.

It is a strong prime.

It is an emirp because it is prime and its reverse (132782893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398287231 - 2¹⁵ = 398254463 is a prime.

It is a super-2 number, since 2×398287231² = 317265436755294722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398287261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199143615 + 199143616.

It is an arithmetic number, because the mean of its divisors is an integer number (199143616).

Almost surely, 2^398287231 is an apocalyptic number.

398287231 is a deficient number, since it is larger than the sum of its proper divisors (1).

398287231 is an equidigital number, since it uses as much as digits as its factorization.

398287231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 398287231 is about 19957.1348394503. The cubic root of 398287231 is about 735.7531459628.

The spelling of 398287231 in words is "three hundred ninety-eight million, two hundred eighty-seven thousand, two hundred thirty-one".