2188839 has 4 divisors (see below), whose sum is σ = 2918456. Its totient is φ = 1459224.

The previous prime is 2188831. The next prime is 2188861. The reversal of 2188839 is 9388812.

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

It is not a de Polignac number, because 2188839 - 2³ = 2188831 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2188797 and 2188806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188831) 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, 364804 + ... + 364809.

It is an arithmetic number, because the mean of its divisors is an integer number (729614).

2^2188839 is an apocalyptic number.

2188839 is a deficient number, since it is larger than the sum of its proper divisors (729617).

2188839 is an equidigital number, since it uses as much as digits as its factorization.

2188839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729616.

The product of its digits is 27648, while the sum is 39.

The square root of 2188839 is about 1479.4725411443. The cubic root of 2188839 is about 129.8388338090.

The spelling of 2188839 in words is "two million, one hundred eighty-eight thousand, eight hundred thirty-nine".