850709 has 4 divisors (see below), whose sum is σ = 871500. Its totient is φ = 829920.

The previous prime is 850691. The next prime is 850711. The reversal of 850709 is 907058.

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 31684 + 819025 = 178^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 850709 - 2⁸ = 850453 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 850709.

It is not an unprimeable number, because it can be changed into a prime (850009) 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, 10334 + ... + 10415.

It is an arithmetic number, because the mean of its divisors is an integer number (217875).

2⁸⁵⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

850709 is a deficient number, since it is larger than the sum of its proper divisors (20791).

850709 is a wasteful number, since it uses less digits than its factorization.

850709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20790.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 850709 is about 922.3388748177. The cubic root of 850709 is about 94.7531541708.

The spelling of 850709 in words is "eight hundred fifty thousand, seven hundred nine".