729811 has 4 divisors (see below), whose sum is σ = 733824. Its totient is φ = 725800.

The previous prime is 729791. The next prime is 729821. The reversal of 729811 is 118927.

729811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 729811 - 2⁵ = 729779 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 729811.

It is not an unprimeable number, because it can be changed into a prime (729821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1720 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (183456).

2⁷²⁹⁸¹¹ is an apocalyptic number.

729811 is a deficient number, since it is larger than the sum of its proper divisors (4013).

729811 is a wasteful number, since it uses less digits than its factorization.

729811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4012.

The product of its digits is 1008, while the sum is 28.

The square root of 729811 is about 854.2897634878. The cubic root of 729811 is about 90.0333621171.

It can be divided in two parts, 729 and 811, that added together give a triangular number (1540 = T₅₅).

The spelling of 729811 in words is "seven hundred twenty-nine thousand, eight hundred eleven".