998985 has 32 divisors (see below), whose sum is σ = 1774080. Its totient is φ = 476928.

The previous prime is 998983. The next prime is 998989. The reversal of 998985 is 589899.

998985 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 998985 - 2¹ = 998983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9111 + ... + 9219.

It is an arithmetic number, because the mean of its divisors is an integer number (55440).

2⁹⁹⁸⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

998985 is a deficient number, since it is larger than the sum of its proper divisors (775095).

998985 is a wasteful number, since it uses less digits than its factorization.

998985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177.

The product of its digits is 233280, while the sum is 48.

The square root of 998985 is about 999.4923711565. The cubic root of 998985 is about 99.9661552133.

The spelling of 998985 in words is "nine hundred ninety-eight thousand, nine hundred eighty-five".