18000729 has 6 divisors (see below), whose sum is σ = 26001066. Its totient is φ = 12000480.

The previous prime is 18000727. The next prime is 18000737. The reversal of 18000729 is 92700081.

It can be written as a sum of positive squares in only one way, i.e., 12110400 + 5890329 = 3480^2 + 2427^2 .

It is not a de Polignac number, because 18000729 - 2¹ = 18000727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18000721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1000032 + ... + 1000049.

It is an arithmetic number, because the mean of its divisors is an integer number (4333511).

Almost surely, 2^18000729 is an apocalyptic number.

It is an amenable number.

18000729 is a deficient number, since it is larger than the sum of its proper divisors (8000337).

18000729 is a wasteful number, since it uses less digits than its factorization.

18000729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000087 (or 2000084 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 18000729 is about 4242.7265997233. The cubic root of 18000729 is about 262.0776773740.

It can be divided in two parts, 1800072 and 9, that added together give a palindrome (1800081).

The spelling of 18000729 in words is "eighteen million, seven hundred twenty-nine", and thus it is an aban number.