18083509 has 4 divisors (see below), whose sum is σ = 18666880. Its totient is φ = 17500140.

The previous prime is 18083479. The next prime is 18083519. The reversal of 18083509 is 90538081.

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: 90538081 = 7019 ⋅12899.

It is a cyclic number.

It is not a de Polignac number, because 18083509 - 2⁵ = 18083477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18083519) 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, 291639 + ... + 291700.

It is an arithmetic number, because the mean of its divisors is an integer number (4666720).

Almost surely, 2^18083509 is an apocalyptic number.

It is an amenable number.

18083509 is a deficient number, since it is larger than the sum of its proper divisors (583371).

18083509 is an equidigital number, since it uses as much as digits as its factorization.

18083509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583370.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18083509 is about 4252.4709287660. The cubic root of 18083509 is about 262.4788022187.

The spelling of 18083509 in words is "eighteen million, eighty-three thousand, five hundred nine".