855988 has 24 divisors (see below), whose sum is σ = 1803200. Its totient is φ = 347328.

The previous prime is 855983. The next prime is 855989. The reversal of 855988 is 889558.

It is a super-2 number, since 2×855988² = 1465430912288, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

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, 273 + ... + 1336.

2⁸⁵⁵⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

855988 is an abundant number, since it is smaller than the sum of its proper divisors (947212).

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

855988 is a wasteful number, since it uses less digits than its factorization.

855988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1637 counting only the distinct ones).

The product of its digits is 115200, while the sum is 43.

The square root of 855988 is about 925.1961954094. The cubic root of 855988 is about 94.9487442806.

The spelling of 855988 in words is "eight hundred fifty-five thousand, nine hundred eighty-eight".