998864 has 20 divisors (see below), whose sum is σ = 1952256. Its totient is φ = 495072.

The previous prime is 998861. The next prime is 998897. The reversal of 998864 is 468899.

It is a nialpdrome in base 10.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2417 + ... + 2799.

2⁹⁹⁸⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

998864 is a deficient number, since it is larger than the sum of its proper divisors (953392).

998864 is a wasteful number, since it uses less digits than its factorization.

998864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 548 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 998864 is about 999.4318385963. The cubic root of 998864 is about 99.9621189854.

The spelling of 998864 in words is "nine hundred ninety-eight thousand, eight hundred sixty-four".