729945 has 16 divisors (see below), whose sum is σ = 1297920. Its totient is φ = 389232.

The previous prime is 729943. The next prime is 729947. The reversal of 729945 is 549927.

729945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (729943) and next prime (729947).

It is not a de Polignac number, because 729945 - 2¹ = 729943 is a prime.

It is a Curzon number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (729941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2569 + ... + 2838.

It is an arithmetic number, because the mean of its divisors is an integer number (81120).

2⁷²⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

729945 is a deficient number, since it is larger than the sum of its proper divisors (567975).

729945 is a wasteful number, since it uses less digits than its factorization.

729945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5421 (or 5415 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 729945 is about 854.3681876100. The cubic root of 729945 is about 90.0388720971.

It can be divided in two parts, 7299 and 45, that multiplied together give a triangular number (328455 = T₈₁₀).

The spelling of 729945 in words is "seven hundred twenty-nine thousand, nine hundred forty-five".