789986 has 4 divisors (see below), whose sum is σ = 1184982. Its totient is φ = 394992.

The previous prime is 789979. The next prime is 790003. The reversal of 789986 is 689987.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 570025 + 219961 = 755^2 + 469^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 789986.

It is an unprimeable number.

789986 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, 197495 + ... + 197498.

2⁷⁸⁹⁹⁸⁶ is an apocalyptic number.

789986 is a deficient number, since it is larger than the sum of its proper divisors (394996).

789986 is a wasteful number, since it uses less digits than its factorization.

789986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394995.

The product of its digits is 217728, while the sum is 47.

The square root of 789986 is about 888.8115660814. The cubic root of 789986 is about 92.4428085717.

Subtracting from 789986 its reverse (689987), we obtain a palindrome (99999).

The spelling of 789986 in words is "seven hundred eighty-nine thousand, nine hundred eighty-six".