729706 has 4 divisors (see below), whose sum is σ = 1094562. Its totient is φ = 364852.

The previous prime is 729689. The next prime is 729713. The reversal of 729706 is 607927.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 607927 = 29 ⋅20963.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 180625 = 741^2 + 425^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182425 + ... + 182428.

2⁷²⁹⁷⁰⁶ is an apocalyptic number.

729706 is a deficient number, since it is larger than the sum of its proper divisors (364856).

729706 is a wasteful number, since it uses less digits than its factorization.

729706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364855.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 729706 is about 854.2283067190. The cubic root of 729706 is about 90.0290441240.

The spelling of 729706 in words is "seven hundred twenty-nine thousand, seven hundred six".