398791 has 8 divisors (see below), whose sum is σ = 425600. Its totient is φ = 372600.

The previous prime is 398771. The next prime is 398813. The reversal of 398791 is 197893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398791 - 2⁵ = 398759 is a prime.

398791 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 398791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2566 + ... + 2716.

It is an arithmetic number, because the mean of its divisors is an integer number (53200).

2³⁹⁸⁷⁹¹ is an apocalyptic number.

398791 is a deficient number, since it is larger than the sum of its proper divisors (26809).

398791 is a wasteful number, since it uses less digits than its factorization.

398791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309.

The product of its digits is 13608, while the sum is 37.

The square root of 398791 is about 631.4990102922. The cubic root of 398791 is about 73.6063218223.

The spelling of 398791 in words is "three hundred ninety-eight thousand, seven hundred ninety-one".