18242449 has 4 divisors (see below), whose sum is σ = 18666736. Its totient is φ = 17818164.

The previous prime is 18242437. The next prime is 18242503. The reversal of 18242449 is 94424281.

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.

It is a cyclic number.

It is not a de Polignac number, because 18242449 - 2¹¹ = 18240401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18242149) 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, 212079 + ... + 212164.

It is an arithmetic number, because the mean of its divisors is an integer number (4666684).

Almost surely, 2^18242449 is an apocalyptic number.

It is an amenable number.

18242449 is a deficient number, since it is larger than the sum of its proper divisors (424287).

18242449 is an equidigital number, since it uses as much as digits as its factorization.

18242449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424286.

The product of its digits is 18432, while the sum is 34.

The square root of 18242449 is about 4271.1180035209. The cubic root of 18242449 is about 263.2455551408.

The spelling of 18242449 in words is "eighteen million, two hundred forty-two thousand, four hundred forty-nine".