398818 has 16 divisors (see below), whose sum is σ = 696384. Its totient is φ = 167760.

The previous prime is 398813. The next prime is 398819. The reversal of 398818 is 818893.

It is not an unprimeable number, because it can be changed into a prime (398813) by changing a digit.

398818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621 + ... + 1087.

It is an arithmetic number, because the mean of its divisors is an integer number (43524).

2³⁹⁸⁸¹⁸ is an apocalyptic number.

398818 is a deficient number, since it is larger than the sum of its proper divisors (297566).

398818 is a wasteful number, since it uses less digits than its factorization.

398818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537.

The product of its digits is 13824, while the sum is 37.

The square root of 398818 is about 631.5203876361. The cubic root of 398818 is about 73.6079829479.

The spelling of 398818 in words is "three hundred ninety-eight thousand, eight hundred eighteen".