855550 has 24 divisors (see below), whose sum is σ = 1620432. Its totient is φ = 336000.

The previous prime is 855527. The next prime is 855581. The reversal of 855550 is 55558.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

855550 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 11 ways as a sum of consecutive naturals, for example, 3430 + ... + 3670.

It is an arithmetic number, because the mean of its divisors is an integer number (67518).

2⁸⁵⁵⁵⁵⁰ is an apocalyptic number.

855550 is a deficient number, since it is larger than the sum of its proper divisors (764882).

855550 is a wasteful number, since it uses less digits than its factorization.

855550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 855550 is about 924.9594585710. The cubic root of 855550 is about 94.9325467617.

The spelling of 855550 in words is "eight hundred fifty-five thousand, five hundred fifty".