18145999 has 4 divisors (see below), whose sum is σ = 18216864. Its totient is φ = 18075136.

The previous prime is 18145997. The next prime is 18146017. The reversal of 18145999 is 99954181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18145999 - 2¹ = 18145997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18145991) 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 3 ways as a sum of consecutive naturals, for example, 35047 + ... + 35560.

It is an arithmetic number, because the mean of its divisors is an integer number (4554216).

Almost surely, 2^18145999 is an apocalyptic number.

18145999 is a deficient number, since it is larger than the sum of its proper divisors (70865).

18145999 is an equidigital number, since it uses as much as digits as its factorization.

18145999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70864.

The product of its digits is 116640, while the sum is 46.

The square root of 18145999 is about 4259.8120850573. The cubic root of 18145999 is about 262.7807982359.

The spelling of 18145999 in words is "eighteen million, one hundred forty-five thousand, nine hundred ninety-nine".