18323861 has 2 divisors, whose sum is σ = 18323862. Its totient is φ = 18323860.

The previous prime is 18323797. The next prime is 18323867. The reversal of 18323861 is 16832381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17901361 + 422500 = 4231^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 18323861 - 2⁶ = 18323797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18323867) 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, 9161930 + 9161931.

It is an arithmetic number, because the mean of its divisors is an integer number (9161931).

Almost surely, 2^18323861 is an apocalyptic number.

It is an amenable number.

18323861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18323861 is an equidigital number, since it uses as much as digits as its factorization.

18323861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 18323861 is about 4280.6379197498. The cubic root of 18323861 is about 263.6365761934.

The spelling of 18323861 in words is "eighteen million, three hundred twenty-three thousand, eight hundred sixty-one".