18000645 has 16 divisors (see below), whose sum is σ = 31016832. Its totient is φ = 8861760.

The previous prime is 18000643. The next prime is 18000649. The reversal of 18000645 is 54600081.

It is not a de Polignac number, because 18000645 - 2¹ = 18000643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45961 + ... + 46350.

It is an arithmetic number, because the mean of its divisors is an integer number (1938552).

Almost surely, 2^18000645 is an apocalyptic number.

18000645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18000645 is a deficient number, since it is larger than the sum of its proper divisors (13016187).

18000645 is a wasteful number, since it uses less digits than its factorization.

18000645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92332.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 18000645 is about 4242.7167004173. The cubic root of 18000645 is about 262.0772697135.

The spelling of 18000645 in words is "eighteen million, six hundred forty-five", and thus it is an aban number.