18382909 has 4 divisors (see below), whose sum is σ = 18565020. Its totient is φ = 18200800.

The previous prime is 18382901. The next prime is 18382919. The reversal of 18382909 is 90928381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15132100 + 3250809 = 3890^2 + 1803^2 .

It is a cyclic number.

It is not a de Polignac number, because 18382909 - 2³ = 18382901 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 (18382901) 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, 90904 + ... + 91105.

It is an arithmetic number, because the mean of its divisors is an integer number (4641255).

Almost surely, 2^18382909 is an apocalyptic number.

It is an amenable number.

18382909 is a deficient number, since it is larger than the sum of its proper divisors (182111).

18382909 is a wasteful number, since it uses less digits than its factorization.

18382909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182110.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 18382909 is about 4287.5294751173. The cubic root of 18382909 is about 263.9194590935.

It can be divided in two parts, 18382 and 909, that added together give a palindrome (19291).

The spelling of 18382909 in words is "eighteen million, three hundred eighty-two thousand, nine hundred nine".