398418 has 8 divisors (see below), whose sum is σ = 796848. Its totient is φ = 132804.

The previous prime is 398417. The next prime is 398423. The reversal of 398418 is 814893.

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

398418 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398418.

It is not an unprimeable number, because it can be changed into a prime (398417) 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, 33196 + ... + 33207.

It is an arithmetic number, because the mean of its divisors is an integer number (99606).

2³⁹⁸⁴¹⁸ is an apocalyptic number.

398418 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398418 is a wasteful number, since it uses less digits than its factorization.

398418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66408.

The product of its digits is 6912, while the sum is 33.

The square root of 398418 is about 631.2036121570. The cubic root of 398418 is about 73.5833660030.

The spelling of 398418 in words is "three hundred ninety-eight thousand, four hundred eighteen".