729218 has 16 divisors (see below), whose sum is σ = 1276800. Its totient is φ = 312228.

The previous prime is 729217. The next prime is 729257. The reversal of 729218 is 812927.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (729217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155 + ... + 1217.

It is an arithmetic number, because the mean of its divisors is an integer number (79800).

2⁷²⁹²¹⁸ is an apocalyptic number.

729218 is a deficient number, since it is larger than the sum of its proper divisors (547582).

729218 is a wasteful number, since it uses less digits than its factorization.

729218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086 (or 1072 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 729218 is about 853.9426210232. The cubic root of 729218 is about 90.0089702993.

The spelling of 729218 in words is "seven hundred twenty-nine thousand, two hundred eighteen".