18380009 has 8 divisors (see below), whose sum is σ = 19987848. Its totient is φ = 16830720.

The previous prime is 18380003. The next prime is 18380027. The reversal of 18380009 is 90008381.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3534400 + 14845609 = 1880^2 + 3853^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18380009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18380003) 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, 13982 + ... + 15239.

It is an arithmetic number, because the mean of its divisors is an integer number (2498481).

Almost surely, 2^18380009 is an apocalyptic number.

It is an amenable number.

18380009 is a deficient number, since it is larger than the sum of its proper divisors (1607839).

18380009 is a wasteful number, since it uses less digits than its factorization.

18380009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29275.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18380009 is about 4287.1912716836. The cubic root of 18380009 is about 263.9055801389.

The spelling of 18380009 in words is "eighteen million, three hundred eighty thousand, nine".