18380203 has 2 divisors, whose sum is σ = 18380204. Its totient is φ = 18380202.

The previous prime is 18380189. The next prime is 18380233. The reversal of 18380203 is 30208381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18380203 - 2¹⁷ = 18249131 is a prime.

It is equal to p_1174039 and since 18380203 and 1174039 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18380233) 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 as a sum of consecutive naturals, namely, 9190101 + 9190102.

It is an arithmetic number, because the mean of its divisors is an integer number (9190102).

Almost surely, 2^18380203 is an apocalyptic number.

18380203 is a deficient number, since it is larger than the sum of its proper divisors (1).

18380203 is an equidigital number, since it uses as much as digits as its factorization.

18380203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18380203 is about 4287.2138971598. The cubic root of 18380203 is about 263.9065086386.

Adding to 18380203 its reverse (30208381), we get a palindrome (48588584).

The spelling of 18380203 in words is "eighteen million, three hundred eighty thousand, two hundred three".