855640 has 16 divisors (see below), whose sum is σ = 1925280. Its totient is φ = 342240.

The previous prime is 855619. The next prime is 855641. The reversal of 855640 is 46558.

It is a junction number, because it is equal to n+sod(n) for n = 855599 and 855608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10656 + ... + 10735.

It is an arithmetic number, because the mean of its divisors is an integer number (120330).

2⁸⁵⁵⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

855640 is an abundant number, since it is smaller than the sum of its proper divisors (1069640).

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

855640 is a wasteful number, since it uses less digits than its factorization.

855640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21402 (or 21398 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 855640 is about 925.0081080726. The cubic root of 855640 is about 94.9358754702.

The spelling of 855640 in words is "eight hundred fifty-five thousand, six hundred forty".