998889 has 8 divisors (see below), whose sum is σ = 1368000. Its totient is φ = 647856.

The previous prime is 998861. The next prime is 998897. The reversal of 998889 is 988899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 998889 - 2⁵ = 998857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4389 + ... + 4610.

It is an arithmetic number, because the mean of its divisors is an integer number (171000).

2⁹⁹⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

998889 is a deficient number, since it is larger than the sum of its proper divisors (369111).

998889 is a wasteful number, since it uses less digits than its factorization.

998889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9039.

The product of its digits is 373248, while the sum is 51.

The square root of 998889 is about 999.4443456241. Note that the first 3 decimals coincide. The cubic root of 998889 is about 99.9629529435.

The spelling of 998889 in words is "nine hundred ninety-eight thousand, eight hundred eighty-nine".