398998 has 4 divisors (see below), whose sum is σ = 598500. Its totient is φ = 199498.

The previous prime is 398989. The next prime is 399023. The reversal of 398998 is 899893.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

398998 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 as a sum of consecutive naturals, namely, 99748 + ... + 99751.

It is an arithmetic number, because the mean of its divisors is an integer number (149625).

2³⁹⁸⁹⁹⁸ is an apocalyptic number.

398998 is a deficient number, since it is larger than the sum of its proper divisors (199502).

398998 is a wasteful number, since it uses less digits than its factorization.

398998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199501.

The product of its digits is 139968, while the sum is 46.

The square root of 398998 is about 631.6628847732. The cubic root of 398998 is about 73.6190552032.

The spelling of 398998 in words is "three hundred ninety-eight thousand, nine hundred ninety-eight".