398815 has 12 divisors (see below), whose sum is σ = 500472. Its totient is φ = 305040.

The previous prime is 398813. The next prime is 398819. The reversal of 398815 is 518893.

398815 = 156² + 157² + ... + 170².

It is not a de Polignac number, because 398815 - 2¹ = 398813 is a prime.

It is a Duffinian number.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 4764 + ... + 4846.

It is an arithmetic number, because the mean of its divisors is an integer number (41706).

2³⁹⁸⁸¹⁵ is an apocalyptic number.

398815 is a deficient number, since it is larger than the sum of its proper divisors (101657).

398815 is an equidigital number, since it uses as much as digits as its factorization.

398815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 119 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 398815 is about 631.5180124114. The cubic root of 398815 is about 73.6077983821.

The spelling of 398815 in words is "three hundred ninety-eight thousand, eight hundred fifteen".