789666 has 8 divisors (see below), whose sum is σ = 1579344. Its totient is φ = 263220.

The previous prime is 789653. The next prime is 789671. The reversal of 789666 is 666987.

It is a happy number.

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

789666 is an admirable number.

It is an Ulam number.

It is an unprimeable number.

789666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65800 + ... + 65811.

It is an arithmetic number, because the mean of its divisors is an integer number (197418).

2⁷⁸⁹⁶⁶⁶ is an apocalyptic number.

789666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

789666 is a wasteful number, since it uses less digits than its factorization.

789666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131616.

The product of its digits is 108864, while the sum is 42.

The square root of 789666 is about 888.6315321887. The cubic root of 789666 is about 92.4303249353.

The spelling of 789666 in words is "seven hundred eighty-nine thousand, six hundred sixty-six".