855980 has 24 divisors (see below), whose sum is σ = 1817088. Its totient is φ = 338688.

The previous prime is 855947. The next prime is 855983. The reversal of 855980 is 89558.

It is a self number, because there is not a number n which added to its sum of digits gives 855980.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 855980.

It is not an unprimeable number, because it can be changed into a prime (855983) 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 7 ways as a sum of consecutive naturals, for example, 2372 + ... + 2708.

It is an arithmetic number, because the mean of its divisors is an integer number (75712).

2⁸⁵⁵⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

855980 is an abundant number, since it is smaller than the sum of its proper divisors (961108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

855980 is a wasteful number, since it uses less digits than its factorization.

855980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 855980 is about 925.1918719920. The cubic root of 855980 is about 94.9484484851.

The spelling of 855980 in words is "eight hundred fifty-five thousand, nine hundred eighty".