840455 has 32 divisors (see below), whose sum is σ = 1313280. Its totient is φ = 501120.

The previous prime is 840451. The next prime is 840457. The reversal of 840455 is 554048.

840455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 840455 - 2² = 840451 is a prime.

It is an Ulam 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 840455.

It is not an unprimeable number, because it can be changed into a prime (840451) 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, 14216 + ... + 14274.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2⁸⁴⁰⁴⁵⁵ is an apocalyptic number.

840455 is a deficient number, since it is larger than the sum of its proper divisors (472825).

840455 is a wasteful number, since it uses less digits than its factorization.

840455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 840455 is about 916.7633282369. The cubic root of 840455 is about 94.3709126484.

The spelling of 840455 in words is "eight hundred forty thousand, four hundred fifty-five".