729447 has 4 divisors (see below), whose sum is σ = 972600. Its totient is φ = 486296.

The previous prime is 729413. The next prime is 729451. The reversal of 729447 is 744927.

729447 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, and also an emirpimes, since its reverse is a distinct semiprime: 744927 = 3 ⋅248309.

It is a cyclic number.

It is not a de Polignac number, because 729447 - 2⁸ = 729191 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729457) 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, 121572 + ... + 121577.

It is an arithmetic number, because the mean of its divisors is an integer number (243150).

2⁷²⁹⁴⁴⁷ is an apocalyptic number.

729447 is a deficient number, since it is larger than the sum of its proper divisors (243153).

729447 is a wasteful number, since it uses less digits than its factorization.

729447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243152.

The product of its digits is 14112, while the sum is 33.

The square root of 729447 is about 854.0766944485. The cubic root of 729447 is about 90.0183913032.

It can be divided in two parts, 729 and 447, that added together give a triangular number (1176 = T₄₈).

The spelling of 729447 in words is "seven hundred twenty-nine thousand, four hundred forty-seven".