398017 has 4 divisors (see below), whose sum is σ = 399280. Its totient is φ = 396756.

The previous prime is 398011. The next prime is 398023. The reversal of 398017 is 710893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 710893 = 137 ⋅5189.

It is an interprime number because it is at equal distance from previous prime (398011) and next prime (398023).

It is a cyclic number.

It is not a de Polignac number, because 398017 - 2¹⁵ = 365249 is a prime.

It is a Duffinian number.

398017 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (398011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298 + ... + 940.

It is an arithmetic number, because the mean of its divisors is an integer number (99820).

2³⁹⁸⁰¹⁷ is an apocalyptic number.

It is an amenable number.

398017 is a deficient number, since it is larger than the sum of its proper divisors (1263).

398017 is an equidigital number, since it uses as much as digits as its factorization.

398017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 398017 is about 630.8858850854. The cubic root of 398017 is about 73.5586709719.

The spelling of 398017 in words is "three hundred ninety-eight thousand, seventeen".