18102389 has 2 divisors, whose sum is σ = 18102390. Its totient is φ = 18102388.

The previous prime is 18102349. The next prime is 18102391. The reversal of 18102389 is 98320181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 6980164 = 3335^2 + 2642^2 .

It is an emirp because it is prime and its reverse (98320181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18102389 - 2¹² = 18098293 is a prime.

Together with 18102391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18102349) 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, 9051194 + 9051195.

It is an arithmetic number, because the mean of its divisors is an integer number (9051195).

Almost surely, 2^18102389 is an apocalyptic number.

It is an amenable number.

18102389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18102389 is an equidigital number, since it uses as much as digits as its factorization.

18102389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18102389 is about 4254.6902354931. The cubic root of 18102389 is about 262.5701170213.

The spelling of 18102389 in words is "eighteen million, one hundred two thousand, three hundred eighty-nine".