18245449 has 4 divisors (see below), whose sum is σ = 18263236. Its totient is φ = 18227664.

The previous prime is 18245443. The next prime is 18245483. The reversal of 18245449 is 94454281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10517049 + 7728400 = 3243^2 + 2780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18245449 is a prime.

It is a super-3 number, since 3×18245449³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18245443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7254 + ... + 9439.

It is an arithmetic number, because the mean of its divisors is an integer number (4565809).

Almost surely, 2^18245449 is an apocalyptic number.

It is an amenable number.

18245449 is a deficient number, since it is larger than the sum of its proper divisors (17787).

18245449 is a wasteful number, since it uses less digits than its factorization.

18245449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17786.

The product of its digits is 46080, while the sum is 37.

The square root of 18245449 is about 4271.4691851868. The cubic root of 18245449 is about 263.2599847344.

The spelling of 18245449 in words is "eighteen million, two hundred forty-five thousand, four hundred forty-nine".