729865 has 8 divisors (see below), whose sum is σ = 890568. Its totient is φ = 574080.

The previous prime is 729851. The next prime is 729871. The reversal of 729865 is 568927.

It can be written as a sum of positive squares in 4 ways, for example, as 64009 + 665856 = 253^2 + 816^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 729865 - 2⁷ = 729737 is a prime.

It is a d-powerful number, because it can be written as 7⁵ + 2¹⁰ + 8⁶ + 9⁵ + 6³ + 5⁸ .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 892 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (111321).

2⁷²⁹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

729865 is a deficient number, since it is larger than the sum of its proper divisors (160703).

729865 is a wasteful number, since it uses less digits than its factorization.

729865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459.

The product of its digits is 30240, while the sum is 37.

The square root of 729865 is about 854.3213681045. The cubic root of 729865 is about 90.0355826379.

The spelling of 729865 in words is "seven hundred twenty-nine thousand, eight hundred sixty-five".