398988 has 18 divisors (see below), whose sum is σ = 1008644. Its totient is φ = 132984.

The previous prime is 398977. The next prime is 398989. The reversal of 398988 is 889893.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (398989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5506 + ... + 5577.

2³⁹⁸⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

398988 is an abundant number, since it is smaller than the sum of its proper divisors (609656).

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

398988 is a wasteful number, since it uses less digits than its factorization.

398988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093 (or 11088 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 398988 is about 631.6549691089. The cubic root of 398988 is about 73.6184401653.

The spelling of 398988 in words is "three hundred ninety-eight thousand, nine hundred eighty-eight".