729986 has 4 divisors (see below), whose sum is σ = 1094982. Its totient is φ = 364992.

The previous prime is 729979. The next prime is 729991. The reversal of 729986 is 689927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689927 = 7 ⋅98561.

It can be written as a sum of positive squares in only one way, i.e., 697225 + 32761 = 835^2 + 181^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 729986.

It is an unprimeable number.

729986 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, 182495 + ... + 182498.

2⁷²⁹⁹⁸⁶ is an apocalyptic number.

729986 is a deficient number, since it is larger than the sum of its proper divisors (364996).

729986 is a wasteful number, since it uses less digits than its factorization.

729986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364995.

The product of its digits is 54432, while the sum is 41.

The square root of 729986 is about 854.3921816122. The cubic root of 729986 is about 90.0405578518.

It can be divided in two parts, 7 and 29986, that multiplied together give a palindrome (209902).

The spelling of 729986 in words is "seven hundred twenty-nine thousand, nine hundred eighty-six".