18012729 has 8 divisors (see below), whose sum is σ = 27448000. Its totient is φ = 10292976.

The previous prime is 18012721. The next prime is 18012737. The reversal of 18012729 is 92721081.

It is an interprime number because it is at equal distance from previous prime (18012721) and next prime (18012737).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18012729 - 2³ = 18012721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18012696 and 18012705.

It is not an unprimeable number, because it can be changed into a prime (18012721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428854 + ... + 428895.

It is an arithmetic number, because the mean of its divisors is an integer number (3431000).

Almost surely, 2^18012729 is an apocalyptic number.

It is an amenable number.

18012729 is a deficient number, since it is larger than the sum of its proper divisors (9435271).

18012729 is an equidigital number, since it uses as much as digits as its factorization.

18012729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857759.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 18012729 is about 4244.1405490393. The cubic root of 18012729 is about 262.1359015630.

The spelling of 18012729 in words is "eighteen million, twelve thousand, seven hundred twenty-nine".