2189784 has 32 divisors (see below), whose sum is σ = 5713920. Its totient is φ = 698016.

The previous prime is 2189783. The next prime is 2189791. The reversal of 2189784 is 4879812.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432 + ... + 2535.

It is an arithmetic number, because the mean of its divisors is an integer number (178560).

2^2189784 is an apocalyptic number.

2189784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2189784 is an abundant number, since it is smaller than the sum of its proper divisors (3524136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2189784 is a wasteful number, since it uses less digits than its factorization.

2189784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999 (or 3995 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 2189784 is about 1479.7918772584. The cubic root of 2189784 is about 129.8575164751.

The spelling of 2189784 in words is "two million, one hundred eighty-nine thousand, seven hundred eighty-four".