18423841 has 2 divisors, whose sum is σ = 18423842. Its totient is φ = 18423840.

The previous prime is 18423833. The next prime is 18423893. The reversal of 18423841 is 14832481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 7134241 = 3360^2 + 2671^2 .

It is an emirp because it is prime and its reverse (14832481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18423841 - 2³ = 18423833 is a prime.

It is a Chen prime.

It is equal to p_1176655 and since 18423841 and 1176655 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18423241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9211920 + 9211921.

It is an arithmetic number, because the mean of its divisors is an integer number (9211921).

Almost surely, 2^18423841 is an apocalyptic number.

It is an amenable number.

18423841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18423841 is an equidigital number, since it uses as much as digits as its factorization.

18423841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 31.

The square root of 18423841 is about 4292.3001991939. The cubic root of 18423841 is about 264.1151978507.

It can be divided in two parts, 184 and 23841, that added together give a square (24025 = 155²).

The spelling of 18423841 in words is "eighteen million, four hundred twenty-three thousand, eight hundred forty-one".