2188540 has 24 divisors (see below), whose sum is σ = 4662000. Its totient is φ = 862848.

The previous prime is 2188531. The next prime is 2188541. The reversal of 2188540 is 458812.

2188540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2188499 and 2188508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711 + ... + 2209.

It is an arithmetic number, because the mean of its divisors is an integer number (194250).

2^2188540 is an apocalyptic number.

2188540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2188540 is an abundant number, since it is smaller than the sum of its proper divisors (2473460).

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

2188540 is a wasteful number, since it uses less digits than its factorization.

2188540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581 (or 1579 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 2188540 is about 1479.3714881665. The cubic root of 2188540 is about 129.8329214540.

The spelling of 2188540 in words is "two million, one hundred eighty-eight thousand, five hundred forty".