2187543 has 16 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 1347456.

The previous prime is 2187529. The next prime is 2187571. The reversal of 2187543 is 3457812.

It is not a de Polignac number, because 2187543 - 2⁵ = 2187511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2187543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187583) 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, 2646 + ... + 3372.

It is an arithmetic number, because the mean of its divisors is an integer number (196560).

2^2187543 is an apocalyptic number.

2187543 is a deficient number, since it is larger than the sum of its proper divisors (957417).

2187543 is a wasteful number, since it uses less digits than its factorization.

2187543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806.

The product of its digits is 6720, while the sum is 30.

The square root of 2187543 is about 1479.0344823566. The cubic root of 2187543 is about 129.8132031207.

It can be divided in two parts, 21 and 87543, that multiplied together give a triangular number (1838403 = T₁₉₁₇).

The spelling of 2187543 in words is "two million, one hundred eighty-seven thousand, five hundred forty-three".