2180784 has 20 divisors (see below), whose sum is σ = 5633816. Its totient is φ = 726912.

The previous prime is 2180747. The next prime is 2180797. The reversal of 2180784 is 4870812.

2180784 = T₉₇ + T₉₈ + ... + T₂₄₀.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22669 + ... + 22764.

2^2180784 is an apocalyptic number.

2180784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2180784 is an abundant number, since it is smaller than the sum of its proper divisors (3453032).

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

2180784 is a wasteful number, since it uses less digits than its factorization.

2180784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45444 (or 45438 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 2180784 is about 1476.7477780583. The cubic root of 2180784 is about 129.6793676325.

The spelling of 2180784 in words is "two million, one hundred eighty thousand, seven hundred eighty-four".