18045999 has 24 divisors (see below), whose sum is σ = 27316224. Its totient is φ = 11466000.

The previous prime is 18045997. The next prime is 18046001. The reversal of 18045999 is 99954081.

It is an interprime number because it is at equal distance from previous prime (18045997) and next prime (18046001).

It is not a de Polignac number, because 18045999 - 2¹ = 18045997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18045997) 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 in 23 ways as a sum of consecutive naturals, for example, 19354 + ... + 20264.

It is an arithmetic number, because the mean of its divisors is an integer number (1138176).

Almost surely, 2^18045999 is an apocalyptic number.

18045999 is a deficient number, since it is larger than the sum of its proper divisors (9270225).

18045999 is a wasteful number, since it uses less digits than its factorization.

18045999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 18045999 is about 4248.0582623123. The cubic root of 18045999 is about 262.2971930119.

It can be divided in two parts, 18045 and 999, that added together give a square (19044 = 138²).

The spelling of 18045999 in words is "eighteen million, forty-five thousand, nine hundred ninety-nine".