18360389 has 2 divisors, whose sum is σ = 18360390. Its totient is φ = 18360388.

The previous prime is 18360383. The next prime is 18360427. The reversal of 18360389 is 98306381.

It is an a-pointer prime, because the next prime (18360427) can be obtained adding 18360389 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12837889 + 5522500 = 3583^2 + 2350^2 .

It is an emirp because it is prime and its reverse (98306381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18360389 - 2⁴ = 18360373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18360383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9180194 + 9180195.

It is an arithmetic number, because the mean of its divisors is an integer number (9180195).

Almost surely, 2^18360389 is an apocalyptic number.

It is an amenable number.

18360389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18360389 is an equidigital number, since it uses as much as digits as its factorization.

18360389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18360389 is about 4284.9024492980. The cubic root of 18360389 is about 263.8116434609.

The spelling of 18360389 in words is "eighteen million, three hundred sixty thousand, three hundred eighty-nine".