18043933 has 2 divisors, whose sum is σ = 18043934. Its totient is φ = 18043932.

The previous prime is 18043931. The next prime is 18043943. The reversal of 18043933 is 33934081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12652249 + 5391684 = 3557^2 + 2322^2 .

It is a cyclic number.

It is not a de Polignac number, because 18043933 - 2¹ = 18043931 is a prime.

Together with 18043931, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18043895 and 18043904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18043931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9021966 + 9021967.

It is an arithmetic number, because the mean of its divisors is an integer number (9021967).

Almost surely, 2^18043933 is an apocalyptic number.

It is an amenable number.

18043933 is a deficient number, since it is larger than the sum of its proper divisors (1).

18043933 is an equidigital number, since it uses as much as digits as its factorization.

18043933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 18043933 is about 4247.8150854292. The cubic root of 18043933 is about 262.2871829134.

The spelling of 18043933 in words is "eighteen million, forty-three thousand, nine hundred thirty-three".