18168449 has 8 divisors (see below), whose sum is σ = 20197632. Its totient is φ = 16229520.

The previous prime is 18168439. The next prime is 18168467. The reversal of 18168449 is 94486181.

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

It is a cyclic number.

It is not a de Polignac number, because 18168449 - 2⁴ = 18168433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18168439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22139 + ... + 22944.

It is an arithmetic number, because the mean of its divisors is an integer number (2524704).

Almost surely, 2^18168449 is an apocalyptic number.

It is an amenable number.

18168449 is a deficient number, since it is larger than the sum of its proper divisors (2029183).

18168449 is a wasteful number, since it uses less digits than its factorization.

18168449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45127.

The product of its digits is 55296, while the sum is 41.

The square root of 18168449 is about 4262.4463632989. The cubic root of 18168449 is about 262.8891232666.

The spelling of 18168449 in words is "eighteen million, one hundred sixty-eight thousand, four hundred forty-nine".