729231 has 4 divisors (see below), whose sum is σ = 972312. Its totient is φ = 486152.

The previous prime is 729217. The next prime is 729257. The reversal of 729231 is 132927.

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

It is a cyclic number.

It is not a de Polignac number, because 729231 - 2⁵ = 729199 is a prime.

It is a super-2 number, since 2×729231² = 1063555702722, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 729231.

It is not an unprimeable number, because it can be changed into a prime (729271) 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, 121536 + ... + 121541.

It is an arithmetic number, because the mean of its divisors is an integer number (243078).

2⁷²⁹²³¹ is an apocalyptic number.

729231 is a deficient number, since it is larger than the sum of its proper divisors (243081).

729231 is a wasteful number, since it uses less digits than its factorization.

729231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243080.

The product of its digits is 756, while the sum is 24.

The square root of 729231 is about 853.9502327419. The cubic root of 729231 is about 90.0095051689.

The spelling of 729231 in words is "seven hundred twenty-nine thousand, two hundred thirty-one".