18133809 has 8 divisors (see below), whose sum is σ = 25451040. Its totient is φ = 11452896.

The previous prime is 18133793. The next prime is 18133813. The reversal of 18133809 is 90833181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18133809 - 2⁴ = 18133793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18133809.

It is not an unprimeable number, because it can be changed into a prime (18133889) 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 7 ways as a sum of consecutive naturals, for example, 159012 + ... + 159125.

It is an arithmetic number, because the mean of its divisors is an integer number (3181380).

Almost surely, 2^18133809 is an apocalyptic number.

18133809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18133809 is a deficient number, since it is larger than the sum of its proper divisors (7317231).

18133809 is a wasteful number, since it uses less digits than its factorization.

18133809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318159.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 18133809 is about 4258.3810303917. The cubic root of 18133809 is about 262.7219420018.

The spelling of 18133809 in words is "eighteen million, one hundred thirty-three thousand, eight hundred nine".