398018 has 8 divisors (see below), whose sum is σ = 602112. Its totient is φ = 197316.

The previous prime is 398011. The next prime is 398023. The reversal of 398018 is 810893.

It is a happy number.

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

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, 530 + ... + 1037.

It is an arithmetic number, because the mean of its divisors is an integer number (75264).

2³⁹⁸⁰¹⁸ is an apocalyptic number.

398018 is a deficient number, since it is larger than the sum of its proper divisors (204094).

398018 is a wasteful number, since it uses less digits than its factorization.

398018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 398018 is about 630.8866776213. The cubic root of 398018 is about 73.5587325762.

The spelling of 398018 in words is "three hundred ninety-eight thousand, eighteen".