18245543 has 4 divisors (see below), whose sum is σ = 18261048. Its totient is φ = 18230040.

The previous prime is 18245503. The next prime is 18245581. The reversal of 18245543 is 34554281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34554281 = 1217 ⋅28393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18245543 is a prime.

It is a super-3 number, since 3×18245543³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18245503) 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, 5828 + ... + 8393.

It is an arithmetic number, because the mean of its divisors is an integer number (4565262).

Almost surely, 2^18245543 is an apocalyptic number.

18245543 is a deficient number, since it is larger than the sum of its proper divisors (15505).

18245543 is a wasteful number, since it uses less digits than its factorization.

18245543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15504.

The product of its digits is 19200, while the sum is 32.

The square root of 18245543 is about 4271.4801884124. The cubic root of 18245543 is about 263.2604368362.

The spelling of 18245543 in words is "eighteen million, two hundred forty-five thousand, five hundred forty-three".