729506 has 4 divisors (see below), whose sum is σ = 1094262. Its totient is φ = 364752.

The previous prime is 729503. The next prime is 729511. The reversal of 729506 is 605927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605927 = 7 ⋅86561.

It can be written as a sum of positive squares in only one way, i.e., 600625 + 128881 = 775^2 + 359^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (729503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182375 + ... + 182378.

2⁷²⁹⁵⁰⁶ is an apocalyptic number.

729506 is a deficient number, since it is larger than the sum of its proper divisors (364756).

729506 is a wasteful number, since it uses less digits than its factorization.

729506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364755.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 729506 is about 854.1112339737. Note that the first 3 decimals coincide. The cubic root of 729506 is about 90.0208182294.

The spelling of 729506 in words is "seven hundred twenty-nine thousand, five hundred six".