18281049 has 8 divisors (see below), whose sum is σ = 25215360. Its totient is φ = 11767056.

The previous prime is 18281047. The next prime is 18281077. The reversal of 18281049 is 94018281.

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

It is not a de Polignac number, because 18281049 - 2¹ = 18281047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18281047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104977 + ... + 105150.

It is an arithmetic number, because the mean of its divisors is an integer number (3151920).

Almost surely, 2^18281049 is an apocalyptic number.

It is an amenable number.

18281049 is a deficient number, since it is larger than the sum of its proper divisors (6934311).

18281049 is a wasteful number, since it uses less digits than its factorization.

18281049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210159.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18281049 is about 4275.6343389022. The cubic root of 18281049 is about 263.4310952866.

The spelling of 18281049 in words is "eighteen million, two hundred eighty-one thousand, forty-nine".