18422389 has 2 divisors, whose sum is σ = 18422390. Its totient is φ = 18422388.

The previous prime is 18422351. The next prime is 18422479. The reversal of 18422389 is 98322481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 504100 = 4233^2 + 710^2 .

It is an emirp because it is prime and its reverse (98322481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18422389 - 2¹¹ = 18420341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18422329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9211194 + 9211195.

It is an arithmetic number, because the mean of its divisors is an integer number (9211195).

Almost surely, 2^18422389 is an apocalyptic number.

It is an amenable number.

18422389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18422389 is an equidigital number, since it uses as much as digits as its factorization.

18422389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 18422389 is about 4292.1310557810. The cubic root of 18422389 is about 264.1082592805.

The spelling of 18422389 in words is "eighteen million, four hundred twenty-two thousand, three hundred eighty-nine".