18005706 has 16 divisors (see below), whose sum is σ = 40012800. Its totient is φ = 6001884.

The previous prime is 18005681. The next prime is 18005707. The reversal of 18005706 is 60750081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 18005706.

It is not an unprimeable number, because it can be changed into a prime (18005707) 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 7 ways as a sum of consecutive naturals, for example, 166666 + ... + 166773.

It is an arithmetic number, because the mean of its divisors is an integer number (2500800).

Almost surely, 2^18005706 is an apocalyptic number.

18005706 is an abundant number, since it is smaller than the sum of its proper divisors (22007094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18005706 is a wasteful number, since it uses less digits than its factorization.

18005706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333450 (or 333444 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 18005706 is about 4243.3130923843. The cubic root of 18005706 is about 262.1018289960.

Adding to 18005706 its reverse (60750081), we get a palindrome (78755787).

The spelling of 18005706 in words is "eighteen million, five thousand, seven hundred six".