2198999 has 4 divisors (see below), whose sum is σ = 2398920. Its totient is φ = 1999080.

The previous prime is 2198981. The next prime is 2199061. The reversal of 2198999 is 9998912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2198999 - 2¹² = 2194903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2198909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99944 + ... + 99965.

It is an arithmetic number, because the mean of its divisors is an integer number (599730).

2^2198999 is an apocalyptic number.

2198999 is a deficient number, since it is larger than the sum of its proper divisors (199921).

2198999 is a wasteful number, since it uses less digits than its factorization.

2198999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199920.

The product of its digits is 104976, while the sum is 47.

The square root of 2198999 is about 1482.9022219958. The cubic root of 2198999 is about 130.0394160557.

The spelling of 2198999 in words is "two million, one hundred ninety-eight thousand, nine hundred ninety-nine".