18055543 has 8 divisors (see below), whose sum is σ = 19742976. Its totient is φ = 16375800.

The previous prime is 18055517. The next prime is 18055553. The reversal of 18055543 is 34555081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18055543 - 2⁵ = 18055511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055553) 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, 3730 + ... + 7072.

It is an arithmetic number, because the mean of its divisors is an integer number (2467872).

Almost surely, 2^18055543 is an apocalyptic number.

18055543 is a deficient number, since it is larger than the sum of its proper divisors (1687433).

18055543 is a wasteful number, since it uses less digits than its factorization.

18055543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 18055543 is about 4249.1814505855. The cubic root of 18055543 is about 262.3434252954.

The spelling of 18055543 in words is "eighteen million, fifty-five thousand, five hundred forty-three".