398591 has 2 divisors, whose sum is σ = 398592. Its totient is φ = 398590.

The previous prime is 398581. The next prime is 398609. The reversal of 398591 is 195893.

It is a weak prime.

It is an emirp because it is prime and its reverse (195893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398591 - 2¹⁰ = 397567 is a prime.

It is a Chen prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199295 + 199296.

It is an arithmetic number, because the mean of its divisors is an integer number (199296).

2³⁹⁸⁵⁹¹ is an apocalyptic number.

398591 is a deficient number, since it is larger than the sum of its proper divisors (1).

398591 is an equidigital number, since it uses as much as digits as its factorization.

398591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 398591 is about 631.3406370574. The cubic root of 398591 is about 73.5940148528.

It can be divided in two parts, 398 and 591, that added together give a palindrome (989).

The spelling of 398591 in words is "three hundred ninety-eight thousand, five hundred ninety-one".