2166540 has 24 divisors (see below), whose sum is σ = 6066480. Its totient is φ = 577728.

The previous prime is 2166533. The next prime is 2166547. The reversal of 2166540 is 456612.

It is an interprime number because it is at equal distance from previous prime (2166533) and next prime (2166547).

It is a self number, because there is not a number n which added to its sum of digits gives 2166540.

It is not an unprimeable number, because it can be changed into a prime (2166547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17995 + ... + 18114.

It is an arithmetic number, because the mean of its divisors is an integer number (252770).

2^2166540 is an apocalyptic number.

2166540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166540 is an abundant number, since it is smaller than the sum of its proper divisors (3899940).

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

2166540 is a wasteful number, since it uses less digits than its factorization.

2166540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36121 (or 36119 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2166540 is about 1471.9171172318. The cubic root of 2166540 is about 129.3964129415.

The spelling of 2166540 in words is "two million, one hundred sixty-six thousand, five hundred forty".