856044 has 72 divisors (see below), whose sum is σ = 2562560. Its totient is φ = 235872.

The previous prime is 856043. The next prime is 856057. The reversal of 856044 is 440658.

It is a super-2 number, since 2×856044² = 1465622659872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 855999 and 856017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10797 + ... + 10875.

2⁸⁵⁶⁰⁴⁴ is an apocalyptic number.

856044 is a gapful number since it is divisible by the number (84) 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 856044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1281280).

856044 is an abundant number, since it is smaller than the sum of its proper divisors (1706516).

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

856044 is a wasteful number, since it uses less digits than its factorization.

856044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 856044 is about 925.2264587656. The cubic root of 856044 is about 94.9508147978.

The spelling of 856044 in words is "eight hundred fifty-six thousand, forty-four".