18543849 has 16 divisors (see below), whose sum is σ = 25583040. Its totient is φ = 11939840.

The previous prime is 18543841. The next prime is 18543853. The reversal of 18543849 is 94834581.

It is a cyclic number.

It is not a de Polignac number, because 18543849 - 2³ = 18543841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18543849.

It is not an unprimeable number, because it can be changed into a prime (18543841) 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, 12457 + ... + 13865.

It is an arithmetic number, because the mean of its divisors is an integer number (1598940).

Almost surely, 2^18543849 is an apocalyptic number.

It is an amenable number.

18543849 is a deficient number, since it is larger than the sum of its proper divisors (7039191).

18543849 is a wasteful number, since it uses less digits than its factorization.

18543849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560.

The product of its digits is 138240, while the sum is 42.

The square root of 18543849 is about 4306.2569593558. The cubic root of 18543849 is about 264.6874159347.

The spelling of 18543849 in words is "eighteen million, five hundred forty-three thousand, eight hundred forty-nine".