2197789 has 4 divisors (see below), whose sum is σ = 2397600. Its totient is φ = 1997980.

The previous prime is 2197781. The next prime is 2197799. The reversal of 2197789 is 9877912.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2197789 - 2³ = 2197781 is a prime.

It is a Duffinian number.

2197789 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2197781) 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, 99889 + ... + 99910.

It is an arithmetic number, because the mean of its divisors is an integer number (599400).

2^2197789 is an apocalyptic number.

It is an amenable number.

2197789 is a deficient number, since it is larger than the sum of its proper divisors (199811).

2197789 is a wasteful number, since it uses less digits than its factorization.

2197789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199810.

The product of its digits is 63504, while the sum is 43.

The square root of 2197789 is about 1482.4941821134. The cubic root of 2197789 is about 130.0155602676.

It can be divided in two parts, 219 and 7789, that added together give a palindrome (8008).

The spelling of 2197789 in words is "two million, one hundred ninety-seven thousand, seven hundred eighty-nine".