840965 has 4 divisors (see below), whose sum is σ = 1009164. Its totient is φ = 672768.

The previous prime is 840943. The next prime is 840967. The reversal of 840965 is 569048.

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 229441 + 611524 = 479^2 + 782^2 .

It is a cyclic number.

It is not a de Polignac number, because 840965 - 2⁸ = 840709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840967) 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, 84092 + ... + 84101.

It is an arithmetic number, because the mean of its divisors is an integer number (252291).

2⁸⁴⁰⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

840965 is a deficient number, since it is larger than the sum of its proper divisors (168199).

840965 is a wasteful number, since it uses less digits than its factorization.

840965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168198.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 840965 is about 917.0414385403. The cubic root of 840965 is about 94.3899973242.

The spelling of 840965 in words is "eight hundred forty thousand, nine hundred sixty-five".