18380019 has 8 divisors (see below), whose sum is σ = 28007680. Its totient is φ = 10502856.

The previous prime is 18380003. The next prime is 18380027. The reversal of 18380019 is 91008381.

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

It is not a de Polignac number, because 18380019 - 2⁴ = 18380003 is a prime.

It is a super-2 number, since 2×18380019² = 675650196880722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18380069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437599 + ... + 437640.

It is an arithmetic number, because the mean of its divisors is an integer number (3500960).

Almost surely, 2^18380019 is an apocalyptic number.

18380019 is a deficient number, since it is larger than the sum of its proper divisors (9627661).

18380019 is an equidigital number, since it uses as much as digits as its factorization.

18380019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875249.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 18380019 is about 4287.1924379482. The cubic root of 18380019 is about 263.9056279998.

The spelling of 18380019 in words is "eighteen million, three hundred eighty thousand, nineteen".