2186540 has 48 divisors (see below), whose sum is σ = 4989600. Its totient is φ = 801792.

The previous prime is 2186537. The next prime is 2186543. The reversal of 2186540 is 456812.

2186540 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2186537) and next prime (2186543).

It is not an unprimeable number, because it can be changed into a prime (2186543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20006 + ... + 20114.

It is an arithmetic number, because the mean of its divisors is an integer number (103950).

2^2186540 is an apocalyptic number.

2186540 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 2186540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2494800).

2186540 is an abundant number, since it is smaller than the sum of its proper divisors (2803060).

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

2186540 is a wasteful number, since it uses less digits than its factorization.

2186540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2186540 is about 1478.6953709267. The cubic root of 2186540 is about 129.7933600750.

The spelling of 2186540 in words is "two million, one hundred eighty-six thousand, five hundred forty".