789665 has 4 divisors (see below), whose sum is σ = 947604. Its totient is φ = 631728.

The previous prime is 789653. The next prime is 789671. The reversal of 789665 is 566987.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 602176 + 187489 = 776^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 789665 - 2¹² = 785569 is a prime.

It is a Duffinian number.

It is an unprimeable 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, 78962 + ... + 78971.

It is an arithmetic number, because the mean of its divisors is an integer number (236901).

2⁷⁸⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

789665 is a deficient number, since it is larger than the sum of its proper divisors (157939).

789665 is a wasteful number, since it uses less digits than its factorization.

789665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157938.

The product of its digits is 90720, while the sum is 41.

The square root of 789665 is about 888.6309695256. The cubic root of 789665 is about 92.4302859186.

The spelling of 789665 in words is "seven hundred eighty-nine thousand, six hundred sixty-five".