842665 has 4 divisors (see below), whose sum is σ = 1011204. Its totient is φ = 674128.

The previous prime is 842657. The next prime is 842701. The reversal of 842665 is 566248.

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 196249 + 646416 = 443^2 + 804^2 .

It is a cyclic number.

It is not a de Polignac number, because 842665 - 2³ = 842657 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84262 + ... + 84271.

It is an arithmetic number, because the mean of its divisors is an integer number (252801).

2⁸⁴²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

842665 is a deficient number, since it is larger than the sum of its proper divisors (168539).

842665 is a wasteful number, since it uses less digits than its factorization.

842665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168538.

The product of its digits is 11520, while the sum is 31.

The square root of 842665 is about 917.9678643613. The cubic root of 842665 is about 94.4535572394.

The spelling of 842665 in words is "eight hundred forty-two thousand, six hundred sixty-five".