729861 has 16 divisors (see below), whose sum is σ = 1124928. Its totient is φ = 416000.

The previous prime is 729851. The next prime is 729871. The reversal of 729861 is 168927.

It is an interprime number because it is at equal distance from previous prime (729851) and next prime (729871).

It is a cyclic number.

It is not a de Polignac number, because 729861 - 2¹⁰ = 728837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 729861.

It is not an unprimeable number, because it can be changed into a prime (729821) 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, 90 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (70308).

2⁷²⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

729861 is a deficient number, since it is larger than the sum of its proper divisors (395067).

729861 is a wasteful number, since it uses less digits than its factorization.

729861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332.

The product of its digits is 6048, while the sum is 33.

The square root of 729861 is about 854.3190270619. The cubic root of 729861 is about 90.0354181586.

The spelling of 729861 in words is "seven hundred twenty-nine thousand, eight hundred sixty-one".