840255 has 32 divisors (see below), whose sum is σ = 1505280. Its totient is φ = 397440.

The previous prime is 840253. The next prime is 840269. The reversal of 840255 is 552048.

It is not a de Polignac number, because 840255 - 2¹ = 840253 is a prime.

840255 is a lucky 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 840255.

It is not an unprimeable number, because it can be changed into a prime (840253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5976 + ... + 6114.

It is an arithmetic number, because the mean of its divisors is an integer number (47040).

2⁸⁴⁰²⁵⁵ is an apocalyptic number.

840255 is a deficient number, since it is larger than the sum of its proper divisors (665025).

840255 is a wasteful number, since it uses less digits than its factorization.

840255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 840255 is about 916.6542423400. The cubic root of 840255 is about 94.3634263544.

The spelling of 840255 in words is "eight hundred forty thousand, two hundred fifty-five".