398618 has 8 divisors (see below), whose sum is σ = 652320. Its totient is φ = 181180.

The previous prime is 398611. The next prime is 398621. The reversal of 398618 is 816893.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398618.

It is not an unprimeable number, because it can be changed into a prime (398611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9038 + ... + 9081.

It is an arithmetic number, because the mean of its divisors is an integer number (81540).

2³⁹⁸⁶¹⁸ is an apocalyptic number.

398618 is a deficient number, since it is larger than the sum of its proper divisors (253702).

398618 is a wasteful number, since it uses less digits than its factorization.

398618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18132.

The product of its digits is 10368, while the sum is 35.

The square root of 398618 is about 631.3620197636. The cubic root of 398618 is about 73.5956765340.

It can be divided in two parts, 3986 and 18, that added together give a palindrome (4004).

The spelling of 398618 in words is "three hundred ninety-eight thousand, six hundred eighteen".