18538449 has 32 divisors (see below), whose sum is σ = 27319680. Its totient is φ = 11136000.

The previous prime is 18538439. The next prime is 18538463. The reversal of 18538449 is 94483581.

It is not a de Polignac number, because 18538449 - 2²⁰ = 17489873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18538449.

It is not an unprimeable number, because it can be changed into a prime (18538439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183499 + ... + 183599.

It is an arithmetic number, because the mean of its divisors is an integer number (853740).

Almost surely, 2^18538449 is an apocalyptic number.

It is an amenable number.

18538449 is a deficient number, since it is larger than the sum of its proper divisors (8781231).

18538449 is a wasteful number, since it uses less digits than its factorization.

18538449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

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

The square root of 18538449 is about 4305.6299190711. The cubic root of 18538449 is about 264.6617209669.

The spelling of 18538449 in words is "eighteen million, five hundred thirty-eight thousand, four hundred forty-nine".