18243959 has 2 divisors, whose sum is σ = 18243960. Its totient is φ = 18243958.

The previous prime is 18243949. The next prime is 18243983. The reversal of 18243959 is 95934281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18243959 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 (18243949) 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, 9121979 + 9121980.

It is an arithmetic number, because the mean of its divisors is an integer number (9121980).

Almost surely, 2^18243959 is an apocalyptic number.

18243959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18243959 is an equidigital number, since it uses as much as digits as its factorization.

18243959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 18243959 is about 4271.2947685684. The cubic root of 18243959 is about 263.2528182340.

The spelling of 18243959 in words is "eighteen million, two hundred forty-three thousand, nine hundred fifty-nine".