397998 has 12 divisors (see below), whose sum is σ = 862368. Its totient is φ = 132660.

The previous prime is 397981. The next prime is 398011. The reversal of 397998 is 899793.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

397998 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 5 ways as a sum of consecutive naturals, for example, 11038 + ... + 11073.

It is an arithmetic number, because the mean of its divisors is an integer number (71864).

2³⁹⁷⁹⁹⁸ is an apocalyptic number.

397998 is an abundant number, since it is smaller than the sum of its proper divisors (464370).

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

397998 is a wasteful number, since it uses less digits than its factorization.

397998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22119 (or 22116 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 397998 is about 630.8708267149. The cubic root of 397998 is about 73.5575004717.

The spelling of 397998 in words is "three hundred ninety-seven thousand, nine hundred ninety-eight".