18745729 has 8 divisors (see below), whose sum is σ = 19388160. Its totient is φ = 18114096.

The previous prime is 18745709. The next prime is 18745751. The reversal of 18745729 is 92754781.

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

It is a cyclic number.

It is not a de Polignac number, because 18745729 - 2⁹ = 18745217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18745709) 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, 912 + ... + 6190.

It is an arithmetic number, because the mean of its divisors is an integer number (2423520).

Almost surely, 2^18745729 is an apocalyptic number.

It is an amenable number.

18745729 is a deficient number, since it is larger than the sum of its proper divisors (642431).

18745729 is an equidigital number, since it uses as much as digits as its factorization.

18745729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399.

The product of its digits is 141120, while the sum is 43.

The square root of 18745729 is about 4329.6338182345. The cubic root of 18745729 is about 265.6444691427.

The spelling of 18745729 in words is "eighteen million, seven hundred forty-five thousand, seven hundred twenty-nine".