18019449 has 32 divisors (see below), whose sum is σ = 30986240. Its totient is φ = 10136016.

The previous prime is 18019427. The next prime is 18019453. The reversal of 18019449 is 94491081.

It is not a de Polignac number, because 18019449 - 2⁷ = 18019321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18019489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11952 + ... + 13374.

It is an arithmetic number, because the mean of its divisors is an integer number (968320).

Almost surely, 2^18019449 is an apocalyptic number.

It is an amenable number.

18019449 is a deficient number, since it is larger than the sum of its proper divisors (12966791).

18019449 is a wasteful number, since it uses less digits than its factorization.

18019449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506 (or 1500 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18019449 is about 4244.9321549349. The cubic root of 18019449 is about 262.1684958142.

The spelling of 18019449 in words is "eighteen million, nineteen thousand, four hundred forty-nine".