398992 has 20 divisors (see below), whose sum is σ = 843696. Its totient is φ = 181280.

The previous prime is 398989. The next prime is 399023. The reversal of 398992 is 299893.

It is a happy number.

It is an unprimeable number.

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, 958 + ... + 1309.

2³⁹⁸⁹⁹² is an apocalyptic number.

It is an amenable number.

398992 is an abundant number, since it is smaller than the sum of its proper divisors (444704).

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

398992 is a wasteful number, since it uses less digits than its factorization.

398992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2286 (or 2280 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 398992 is about 631.6581353865. The cubic root of 398992 is about 73.6186861817.

Subtracting from 398992 its reverse (299893), we obtain a palindrome (99099).

The spelling of 398992 in words is "three hundred ninety-eight thousand, nine hundred ninety-two".