997898 has 16 divisors (see below), whose sum is σ = 1659744. Its totient is φ = 446160.

The previous prime is 997897. The next prime is 997933. The reversal of 997898 is 898799.

997898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (997891) 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, 1136 + ... + 1812.

It is an arithmetic number, because the mean of its divisors is an integer number (103734).

2⁹⁹⁷⁸⁹⁸ is an apocalyptic number.

997898 is a deficient number, since it is larger than the sum of its proper divisors (661846).

997898 is a wasteful number, since it uses less digits than its factorization.

997898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757.

The product of its digits is 326592, while the sum is 50.

The square root of 997898 is about 998.9484471183. The cubic root of 997898 is about 99.9298841825.

Subtracting from 997898 its reverse (898799), we obtain a palindrome (99099).

It can be divided in two parts, 99 and 7898, that added together give a palindrome (7997).

The spelling of 997898 in words is "nine hundred ninety-seven thousand, eight hundred ninety-eight".