2187940 has 12 divisors (see below), whose sum is σ = 4594716. Its totient is φ = 875168.

The previous prime is 2187929. The next prime is 2187943. The reversal of 2187940 is 497812.

It can be written as a sum of positive squares in 2 ways, for example, as 1557504 + 630436 = 1248^2 + 794^2 .

It is not an unprimeable number, because it can be changed into a prime (2187943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54679 + ... + 54718.

It is an arithmetic number, because the mean of its divisors is an integer number (382893).

2^2187940 is an apocalyptic number.

2187940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2187940 is an abundant number, since it is smaller than the sum of its proper divisors (2406776).

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

2187940 is a wasteful number, since it uses less digits than its factorization.

2187940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109406 (or 109404 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2187940 is about 1479.1686854446. The cubic root of 2187940 is about 129.8210555719.

The spelling of 2187940 in words is "two million, one hundred eighty-seven thousand, nine hundred forty".