398817 has 8 divisors (see below), whose sum is σ = 590880. Its totient is φ = 265860.

The previous prime is 398813. The next prime is 398819. The reversal of 398817 is 718893.

It is not a de Polignac number, because 398817 - 2² = 398813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398813) 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, 7359 + ... + 7412.

It is an arithmetic number, because the mean of its divisors is an integer number (73860).

2³⁹⁸⁸¹⁷ is an apocalyptic number.

It is an amenable number.

398817 is a deficient number, since it is larger than the sum of its proper divisors (192063).

398817 is a wasteful number, since it uses less digits than its factorization.

398817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14780 (or 14774 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 398817 is about 631.5195958955. The cubic root of 398817 is about 73.6079214261.

It can be divided in two parts, 3988 and 17, that added together give a triangular number (4005 = T₈₉).

The spelling of 398817 in words is "three hundred ninety-eight thousand, eight hundred seventeen".