2189997 has 20 divisors (see below), whose sum is σ = 3446080. Its totient is φ = 1382184.

The previous prime is 2189989. The next prime is 2190017. The reversal of 2189997 is 7999812.

2189997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2189997 - 2³ = 2189989 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 (2189987) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 828 + ... + 2250.

It is an arithmetic number, because the mean of its divisors is an integer number (172304).

2^2189997 is an apocalyptic number.

2189997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2189997 is a deficient number, since it is larger than the sum of its proper divisors (1256083).

2189997 is a wasteful number, since it uses less digits than its factorization.

2189997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454 (or 1445 counting only the distinct ones).

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

The square root of 2189997 is about 1479.8638450885. The cubic root of 2189997 is about 129.8617267464.

The spelling of 2189997 in words is "two million, one hundred eighty-nine thousand, nine hundred ninety-seven".