855040 has 44 divisors (see below), whose sum is σ = 2063376. Its totient is φ = 339968.

The previous prime is 855031. The next prime is 855059. The reversal of 855040 is 40558.

It is a happy number.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5037 + ... + 5203.

2⁸⁵⁵⁰⁴⁰ is an apocalyptic number.

855040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031688).

855040 is an abundant number, since it is smaller than the sum of its proper divisors (1208336).

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

855040 is a wasteful number, since it uses less digits than its factorization.

855040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 855040 is about 924.6837297152. The cubic root of 855040 is about 94.9136796695.

Adding to 855040 its reverse (40558), we get a palindrome (895598).

The spelling of 855040 in words is "eight hundred fifty-five thousand, forty".