18372543 has 16 divisors (see below), whose sum is σ = 28085760. Its totient is φ = 10465056.

The previous prime is 18372533. The next prime is 18372569. The reversal of 18372543 is 34527381.

It is not a de Polignac number, because 18372543 - 2⁴ = 18372527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18372533) 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, 6321 + ... + 8757.

It is an arithmetic number, because the mean of its divisors is an integer number (1755360).

Almost surely, 2^18372543 is an apocalyptic number.

18372543 is a deficient number, since it is larger than the sum of its proper divisors (9713217).

18372543 is a wasteful number, since it uses less digits than its factorization.

18372543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806.

The product of its digits is 20160, while the sum is 33.

The square root of 18372543 is about 4286.3204499897. The cubic root of 18372543 is about 263.8698422909.

It can be divided in two parts, 18372 and 543, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 18372543 in words is "eighteen million, three hundred seventy-two thousand, five hundred forty-three".