18124509 has 16 divisors (see below), whose sum is σ = 26208000. Its totient is φ = 11075136.

The previous prime is 18124493. The next prime is 18124511. The reversal of 18124509 is 90542181.

It is a happy number.

It is not a de Polignac number, because 18124509 - 2⁴ = 18124493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18124549) 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 15 ways as a sum of consecutive naturals, for example, 4252 + ... + 7370.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^18124509 is an apocalyptic number.

It is an amenable number.

18124509 is a deficient number, since it is larger than the sum of its proper divisors (8083491).

18124509 is a wasteful number, since it uses less digits than its factorization.

18124509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3284.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 18124509 is about 4257.2889260655. The cubic root of 18124509 is about 262.6770216385.

The spelling of 18124509 in words is "eighteen million, one hundred twenty-four thousand, five hundred nine".