789661 has 4 divisors (see below), whose sum is σ = 792252. Its totient is φ = 787072.

The previous prime is 789653. The next prime is 789671. The reversal of 789661 is 166987.

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 481636 + 308025 = 694^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 789661 - 2³ = 789653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 789661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (789611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766 + ... + 1471.

It is an arithmetic number, because the mean of its divisors is an integer number (198063).

2⁷⁸⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

789661 is a deficient number, since it is larger than the sum of its proper divisors (2591).

789661 is a wasteful number, since it uses less digits than its factorization.

789661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590.

The product of its digits is 18144, while the sum is 37.

The square root of 789661 is about 888.6287188697. The cubic root of 789661 is about 92.4301298517.

The spelling of 789661 in words is "seven hundred eighty-nine thousand, six hundred sixty-one".