729866 has 8 divisors (see below), whose sum is σ = 1152480. Its totient is φ = 345708.

The previous prime is 729851. The next prime is 729871. The reversal of 729866 is 668927.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 19207 = 729866 / (7 + 2 + 9 + 8 + 6 + 6).

It is a d-powerful number, because it can be written as 7⁶ + 2¹⁹ + 8⁵ + 9³ + 6⁵ + 6⁶ .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9566 + ... + 9641.

It is an arithmetic number, because the mean of its divisors is an integer number (144060).

2⁷²⁹⁸⁶⁶ is an apocalyptic number.

729866 is a deficient number, since it is larger than the sum of its proper divisors (422614).

729866 is a wasteful number, since it uses less digits than its factorization.

729866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19228.

The product of its digits is 36288, while the sum is 38.

The square root of 729866 is about 854.3219533642. The cubic root of 729866 is about 90.0356237576.

The spelling of 729866 in words is "seven hundred twenty-nine thousand, eight hundred sixty-six".