729805 has 8 divisors (see below), whose sum is σ = 880992. Its totient is φ = 580368.

The previous prime is 729791. The next prime is 729821. The reversal of 729805 is 508927.

729805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 729805 - 2⁹ = 729293 is a prime.

It is a Duffinian number.

729805 is a lucky number.

It is a congruent number.

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, 814 + ... + 1456.

It is an arithmetic number, because the mean of its divisors is an integer number (110124).

2⁷²⁹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

729805 is a deficient number, since it is larger than the sum of its proper divisors (151187).

729805 is a wasteful number, since it uses less digits than its factorization.

729805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 729805 is about 854.2862517915. The cubic root of 729805 is about 90.0331153858.

The spelling of 729805 in words is "seven hundred twenty-nine thousand, eight hundred five".