18449 has 4 divisors (see below), whose sum is σ = 19440. Its totient is φ = 17460.

The previous prime is 18443. The next prime is 18451. The reversal of 18449 is 94481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94481 = 107 ⋅883.

It is a cyclic number.

It is not a de Polignac number, because 18449 - 2⁴ = 18433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (18443) 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, 467 + ... + 504.

It is an arithmetic number, because the mean of its divisors is an integer number (4860).

2¹⁸⁴⁴⁹ is an apocalyptic number.

18449 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18449 is a deficient number, since it is larger than the sum of its proper divisors (991).

18449 is an equidigital number, since it uses as much as digits as its factorization.

18449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990.

The product of its digits is 1152, while the sum is 26.

The square root of 18449 is about 135.8270959713. The cubic root of 18449 is about 26.4235365552.

The spelling of 18449 in words is "eighteen thousand, four hundred forty-nine".