18301889 has 2 divisors, whose sum is σ = 18301890. Its totient is φ = 18301888.

The previous prime is 18301861. The next prime is 18301931. The reversal of 18301889 is 98810381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14691889 + 3610000 = 3833^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 18301889 - 2¹² = 18297793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18301849) 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 as a sum of consecutive naturals, namely, 9150944 + 9150945.

It is an arithmetic number, because the mean of its divisors is an integer number (9150945).

Almost surely, 2^18301889 is an apocalyptic number.

It is an amenable number.

18301889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18301889 is an equidigital number, since it uses as much as digits as its factorization.

18301889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 18301889 is about 4278.0707100281. The cubic root of 18301889 is about 263.5311591874.

The spelling of 18301889 in words is "eighteen million, three hundred one thousand, eight hundred eighty-nine".