2186440 has 32 divisors (see below), whose sum is σ = 5028480. Its totient is φ = 855232.

The previous prime is 2186389. The next prime is 2186453. The reversal of 2186440 is 446812.

2186440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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, 1299 + ... + 2461.

It is an arithmetic number, because the mean of its divisors is an integer number (157140).

2^2186440 is an apocalyptic number.

2186440 is a gapful number since it is divisible by the number (20) 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 2186440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2514240).

2186440 is an abundant number, since it is smaller than the sum of its proper divisors (2842040).

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

2186440 is a wasteful number, since it uses less digits than its factorization.

2186440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 2186440 is about 1478.6615569494. The cubic root of 2186440 is about 129.7913813729.

It can be divided in two parts, 21864 and 40, that added together give a square (21904 = 148²).

The spelling of 2186440 in words is "two million, one hundred eighty-six thousand, four hundred forty".