2189999 has 4 divisors (see below), whose sum is σ = 2502864. Its totient is φ = 1877136.

The previous prime is 2189989. The next prime is 2190017. The reversal of 2189999 is 9999812.

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 2189999 - 2⁸ = 2189743 is a prime.

It is a super-3 number, since 3×2189999³ = 31510333835119709997, which contains 333 as substring.

2189999 is a modest number, since divided by 9999 gives 218 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189939) 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, 156422 + ... + 156435.

It is an arithmetic number, because the mean of its divisors is an integer number (625716).

2^2189999 is an apocalyptic number.

2189999 is a deficient number, since it is larger than the sum of its proper divisors (312865).

2189999 is an equidigital number, since it uses as much as digits as its factorization.

2189999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312864.

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

The square root of 2189999 is about 1479.8645208261. The cubic root of 2189999 is about 129.8617662782.

The spelling of 2189999 in words is "two million, one hundred eighty-nine thousand, nine hundred ninety-nine".