18380051 has 4 divisors (see below), whose sum is σ = 18425400. Its totient is φ = 18334704.

The previous prime is 18380027. The next prime is 18380053. The reversal of 18380051 is 15008381.

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

It is a cyclic number.

It is not a de Polignac number, because 18380051 - 2⁶ = 18379987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18380051.

It is not an unprimeable number, because it can be changed into a prime (18380053) 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 3 ways as a sum of consecutive naturals, for example, 22061 + ... + 22878.

It is an arithmetic number, because the mean of its divisors is an integer number (4606350).

Almost surely, 2^18380051 is an apocalyptic number.

18380051 is a deficient number, since it is larger than the sum of its proper divisors (45349).

18380051 is an equidigital number, since it uses as much as digits as its factorization.

18380051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45348.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18380051 is about 4287.1961699927. The cubic root of 18380051 is about 263.9057811548.

The spelling of 18380051 in words is "eighteen million, three hundred eighty thousand, fifty-one".