18421449 has 16 divisors (see below), whose sum is σ = 25612608. Its totient is φ = 11765952.

The previous prime is 18421439. The next prime is 18421483. The reversal of 18421449 is 94412481.

It is not a de Polignac number, because 18421449 - 2⁴ = 18421433 is a prime.

It is a super-3 number, since 3×18421449³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18421439) 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 15 ways as a sum of consecutive naturals, for example, 6199 + ... + 8675.

It is an arithmetic number, because the mean of its divisors is an integer number (1600788).

Almost surely, 2^18421449 is an apocalyptic number.

It is an amenable number.

18421449 is a deficient number, since it is larger than the sum of its proper divisors (7191159).

18421449 is a wasteful number, since it uses less digits than its factorization.

18421449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584.

The product of its digits is 9216, while the sum is 33.

The square root of 18421449 is about 4292.0215516700. The cubic root of 18421449 is about 264.1037671742.

The spelling of 18421449 in words is "eighteen million, four hundred twenty-one thousand, four hundred forty-nine".