729718 has 16 divisors (see below), whose sum is σ = 1224720. Its totient is φ = 323200.

The previous prime is 729713. The next prime is 729719. The reversal of 729718 is 817927.

729718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729713) by changing a digit.

729718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (76545).

2⁷²⁹⁷¹⁸ is an apocalyptic number.

729718 is a deficient number, since it is larger than the sum of its proper divisors (495002).

729718 is a wasteful number, since it uses less digits than its factorization.

729718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863.

The product of its digits is 7056, while the sum is 34.

The square root of 729718 is about 854.2353305735. The cubic root of 729718 is about 90.0295376299.

Subtracting 729718 from its reverse (817927), we obtain a square (88209 = 297²).

The spelling of 729718 in words is "seven hundred twenty-nine thousand, seven hundred eighteen".