729705 has 8 divisors (see below), whose sum is σ = 1167552. Its totient is φ = 389168.

The previous prime is 729689. The next prime is 729713. The reversal of 729705 is 507927.

It is a happy number.

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 729705 - 2⁴ = 729689 is a prime.

It is a Curzon number.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24309 + ... + 24338.

It is an arithmetic number, because the mean of its divisors is an integer number (145944).

2⁷²⁹⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

729705 is a deficient number, since it is larger than the sum of its proper divisors (437847).

729705 is a wasteful number, since it uses less digits than its factorization.

729705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48655.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 729705 is about 854.2277213952. The cubic root of 729705 is about 90.0290029983.

The spelling of 729705 in words is "seven hundred twenty-nine thousand, seven hundred five".