840765 has 16 divisors (see below), whose sum is σ = 1404288. Its totient is φ = 428736.

The previous prime is 840761. The next prime is 840767. The reversal of 840765 is 567048.

It is a happy number.

It is not a de Polignac number, because 840765 - 2² = 840761 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 874 + ... + 1563.

It is an arithmetic number, because the mean of its divisors is an integer number (87768).

2⁸⁴⁰⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

840765 is a deficient number, since it is larger than the sum of its proper divisors (563523).

840765 is a wasteful number, since it uses less digits than its factorization.

840765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 840765 is about 916.9323857297. The cubic root of 840765 is about 94.3825140575.

The spelling of 840765 in words is "eight hundred forty thousand, seven hundred sixty-five".