18243983 has 2 divisors, whose sum is σ = 18243984. Its totient is φ = 18243982.

The previous prime is 18243959. The next prime is 18243989. The reversal of 18243983 is 38934281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18243983 - 2²⁴ = 1466767 is a prime.

It is a Chen prime.

It is equal to p_1165898 and since 18243983 and 1165898 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18243989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9121991 + 9121992.

It is an arithmetic number, because the mean of its divisors is an integer number (9121992).

Almost surely, 2^18243983 is an apocalyptic number.

18243983 is a deficient number, since it is larger than the sum of its proper divisors (1).

18243983 is an equidigital number, since it uses as much as digits as its factorization.

18243983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 18243983 is about 4271.2975780201. The cubic root of 18243983 is about 263.2529336706.

The spelling of 18243983 in words is "eighteen million, two hundred forty-three thousand, nine hundred eighty-three".