729181 has 8 divisors (see below), whose sum is σ = 786240. Its totient is φ = 673728.

The previous prime is 729173. The next prime is 729187. The reversal of 729181 is 181927.

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 729181 - 2³ = 729173 is a prime.

It is a super-2 number, since 2×729181² = 1063409861522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729187) 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, 640 + ... + 1366.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2⁷²⁹¹⁸¹ is an apocalyptic number.

It is an amenable number.

729181 is a deficient number, since it is larger than the sum of its proper divisors (57059).

729181 is a wasteful number, since it uses less digits than its factorization.

729181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803.

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

The square root of 729181 is about 853.9209565293. The cubic root of 729181 is about 90.0074479433.

The spelling of 729181 in words is "seven hundred twenty-nine thousand, one hundred eighty-one".