855240 has 32 divisors (see below), whose sum is σ = 2566080. Its totient is φ = 228032.

The previous prime is 855229. The next prime is 855241. The reversal of 855240 is 42558.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 855240.

It is not an unprimeable number, because it can be changed into a prime (855241) by changing a digit.

855240 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3444 + ... + 3683.

It is an arithmetic number, because the mean of its divisors is an integer number (80190).

2⁸⁵⁵²⁴⁰ is an apocalyptic number.

It is an amenable number.

855240 is an abundant number, since it is smaller than the sum of its proper divisors (1710840).

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

855240 is a wasteful number, since it uses less digits than its factorization.

855240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7141 (or 7137 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 855240 is about 924.7918684764. The cubic root of 855240 is about 94.9210794231.

Adding to 855240 its reverse (42558), we get a palindrome (897798).

The spelling of 855240 in words is "eight hundred fifty-five thousand, two hundred forty".