18073249 has 4 divisors (see below), whose sum is σ = 18086164. Its totient is φ = 18060336.

The previous prime is 18073213. The next prime is 18073259. The reversal of 18073249 is 94237081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94237081 = 397 ⋅237373.

It can be written as a sum of positive squares in 2 ways, for example, as 11662225 + 6411024 = 3415^2 + 2532^2 .

It is a cyclic number.

It is not a de Polignac number, because 18073249 - 2²¹ = 15976097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18073259) 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 3 ways as a sum of consecutive naturals, for example, 4062 + ... + 7255.

It is an arithmetic number, because the mean of its divisors is an integer number (4521541).

Almost surely, 2^18073249 is an apocalyptic number.

It is an amenable number.

18073249 is a deficient number, since it is larger than the sum of its proper divisors (12915).

18073249 is a wasteful number, since it uses less digits than its factorization.

18073249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12914.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 18073249 is about 4251.2644001520. The cubic root of 18073249 is about 262.4291521575.

The spelling of 18073249 in words is "eighteen million, seventy-three thousand, two hundred forty-nine".