998997 has 16 divisors (see below), whose sum is σ = 1392768. Its totient is φ = 636480.

The previous prime is 998989. The next prime is 999007. The reversal of 998997 is 799899.

It is not a de Polignac number, because 998997 - 2³ = 998989 is a prime.

998997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9648 + ... + 9750.

It is an arithmetic number, because the mean of its divisors is an integer number (87048).

2⁹⁹⁸⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

998997 is a deficient number, since it is larger than the sum of its proper divisors (393771).

998997 is a wasteful number, since it uses less digits than its factorization.

998997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220.

The product of its digits is 367416, while the sum is 51.

The square root of 998997 is about 999.4983741858. The cubic root of 998997 is about 99.9665554826.

The spelling of 998997 in words is "nine hundred ninety-eight thousand, nine hundred ninety-seven".