2197998 has 48 divisors (see below), whose sum is σ = 5509296. Its totient is φ = 625920.

The previous prime is 2197973. The next prime is 2198003. The reversal of 2197998 is 8997912.

2197998 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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3040 + ... + 3692.

It is an arithmetic number, because the mean of its divisors is an integer number (114777).

2^2197998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2197998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2754648).

2197998 is an abundant number, since it is smaller than the sum of its proper divisors (3311298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2197998 is a wasteful number, since it uses less digits than its factorization.

2197998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 686 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 2197998 is about 1482.5646697531. The cubic root of 2197998 is about 130.0196814383.

The spelling of 2197998 in words is "two million, one hundred ninety-seven thousand, nine hundred ninety-eight".