18380809 has 8 divisors (see below), whose sum is σ = 20016000. Its totient is φ = 16812432.

The previous prime is 18380797. The next prime is 18380819. The reversal of 18380809 is 90808381.

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

It is a cyclic number.

It is not a de Polignac number, because 18380809 - 2¹¹ = 18378761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18380819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16129 + ... + 17230.

It is an arithmetic number, because the mean of its divisors is an integer number (2502000).

Almost surely, 2^18380809 is an apocalyptic number.

18380809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18380809 is a deficient number, since it is larger than the sum of its proper divisors (1635191).

18380809 is a wasteful number, since it uses less digits than its factorization.

18380809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33407.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18380809 is about 4287.2845718473. The cubic root of 18380809 is about 263.9094089618.

The spelling of 18380809 in words is "eighteen million, three hundred eighty thousand, eight hundred nine".