18136449 has 6 divisors (see below), whose sum is σ = 26197106. Its totient is φ = 12090960.

The previous prime is 18136439. The next prime is 18136463. The reversal of 18136449 is 94463181.

18136449 is a `hidden beast` number, since 1 + 8 + 1 + 3 + 644 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 14400 = 4257^2 + 120^2 .

It is not a de Polignac number, because 18136449 - 2¹⁵ = 18103681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18136409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1007572 + ... + 1007589.

Almost surely, 2^18136449 is an apocalyptic number.

It is an amenable number.

18136449 is a deficient number, since it is larger than the sum of its proper divisors (8060657).

18136449 is a wasteful number, since it uses less digits than its factorization.

18136449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015167 (or 2015164 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18136449 is about 4258.6909960691. The cubic root of 18136449 is about 262.7346907901.

The spelling of 18136449 in words is "eighteen million, one hundred thirty-six thousand, four hundred forty-nine".