2009784 has 48 divisors (see below), whose sum is σ = 5848200. Its totient is φ = 573888.

The previous prime is 2009783. The next prime is 2009789. The reversal of 2009784 is 4879002.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322 + ... + 2030.

2^2009784 is an apocalyptic number.

2009784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2009784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2924100).

2009784 is an abundant number, since it is smaller than the sum of its proper divisors (3838416).

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

2009784 is a wasteful number, since it uses less digits than its factorization.

2009784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732 (or 1721 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 2009784 is about 1417.6685085026. The cubic root of 2009784 is about 126.1972220006.

The spelling of 2009784 in words is "two million, nine thousand, seven hundred eighty-four".