18004999 has 2 divisors, whose sum is σ = 18005000. Its totient is φ = 18004998.

The previous prime is 18004991. The next prime is 18005041. The reversal of 18004999 is 99940081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18004999 - 2³ = 18004991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18004991) 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, 9002499 + 9002500.

It is an arithmetic number, because the mean of its divisors is an integer number (9002500).

Almost surely, 2^18004999 is an apocalyptic number.

18004999 is a deficient number, since it is larger than the sum of its proper divisors (1).

18004999 is an equidigital number, since it uses as much as digits as its factorization.

18004999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 18004999 is about 4243.2297840207. The cubic root of 18004999 is about 262.0983984461.

The spelling of 18004999 in words is "eighteen million, four thousand, nine hundred ninety-nine".