729138 has 8 divisors (see below), whose sum is σ = 1458288. Its totient is φ = 243044.

The previous prime is 729073. The next prime is 729139. The reversal of 729138 is 831927.

It is a happy number.

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

729138 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 729138.

It is not an unprimeable number, because it can be changed into a prime (729139) by changing a digit.

729138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60756 + ... + 60767.

It is an arithmetic number, because the mean of its divisors is an integer number (182286).

2⁷²⁹¹³⁸ is an apocalyptic number.

729138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

729138 is a wasteful number, since it uses less digits than its factorization.

729138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121528.

The product of its digits is 3024, while the sum is 30.

The square root of 729138 is about 853.8957781837. The cubic root of 729138 is about 90.0056786540.

The spelling of 729138 in words is "seven hundred twenty-nine thousand, one hundred thirty-eight".