855540 has 108 divisors (see below), whose sum is σ = 3049956. Its totient is φ = 193536.

The previous prime is 855527. The next prime is 855581. The reversal of 855540 is 45558.

It can be written as a sum of positive squares in 2 ways, for example, as 345744 + 509796 = 588^2 + 714^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 8772 + ... + 8868.

2⁸⁵⁵⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524978).

855540 is an abundant number, since it is smaller than the sum of its proper divisors (2194416).

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

855540 is a wasteful number, since it uses less digits than its factorization.

855540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 855540 is about 924.9540529129. The cubic root of 855540 is about 94.9321768908.

It can be divided in two parts, 85 and 5540, that added together give a square (5625 = 75²).

The spelling of 855540 in words is "eight hundred fifty-five thousand, five hundred forty".