729947 has 2 divisors, whose sum is σ = 729948. Its totient is φ = 729946.

The previous prime is 729943. The next prime is 729977. The reversal of 729947 is 749927.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (749927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 729947 - 2² = 729943 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 729947.

It is not a weakly prime, because it can be changed into another prime (729941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364973 + 364974.

It is an arithmetic number, because the mean of its divisors is an integer number (364974).

2⁷²⁹⁹⁴⁷ is an apocalyptic number.

729947 is a deficient number, since it is larger than the sum of its proper divisors (1).

729947 is an equidigital number, since it uses as much as digits as its factorization.

729947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 729947 is about 854.3693580648. The cubic root of 729947 is about 90.0389543305.

The spelling of 729947 in words is "seven hundred twenty-nine thousand, nine hundred forty-seven".