855998 has 32 divisors (see below), whose sum is σ = 1566432. Its totient is φ = 345600.

The previous prime is 855997. The next prime is 856021. The reversal of 855998 is 899558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11690 + ... + 11762.

It is an arithmetic number, because the mean of its divisors is an integer number (48951).

2⁸⁵⁵⁹⁹⁸ is an apocalyptic number.

855998 is a deficient number, since it is larger than the sum of its proper divisors (710434).

855998 is a wasteful number, since it uses less digits than its factorization.

855998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140.

The product of its digits is 129600, while the sum is 44.

The square root of 855998 is about 925.2015996527. The cubic root of 855998 is about 94.9491140224.

The spelling of 855998 in words is "eight hundred fifty-five thousand, nine hundred ninety-eight".