2186780 has 24 divisors (see below), whose sum is σ = 4681152. Its totient is φ = 857792.

The previous prime is 2186773. The next prime is 2186791. The reversal of 2186780 is 876812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (195048).

2^2186780 is an apocalyptic number.

2186780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2186780 is an abundant number, since it is smaller than the sum of its proper divisors (2494372).

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

2186780 is a wasteful number, since it uses less digits than its factorization.

2186780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125 (or 2123 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 2186780 is about 1478.7765213175. The cubic root of 2186780 is about 129.7981087139.

Adding to 2186780 its sum of digits (32), we get a palindrome (2186812).

The spelling of 2186780 in words is "two million, one hundred eighty-six thousand, seven hundred eighty".