729856 has 18 divisors (see below), whose sum is σ = 1457372. Its totient is φ = 364800.

The previous prime is 729851. The next prime is 729871. The reversal of 729856 is 658927.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (729851) by changing a digit.

729856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1170 + ... + 1681.

2⁷²⁹⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

729856 is a deficient number, since it is larger than the sum of its proper divisors (727516).

729856 is an equidigital number, since it uses as much as digits as its factorization.

729856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867 (or 2853 counting only the distinct ones).

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

The square root of 729856 is about 854.3161007496. The cubic root of 729856 is about 90.0352125587.

The spelling of 729856 in words is "seven hundred twenty-nine thousand, eight hundred fifty-six".