856440 has 128 divisors (see below), whose sum is σ = 3124800. Its totient is φ = 207360.
The previous prime is 856421. The next prime is 856441. The reversal of 856440 is 44658.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (856441) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14010 + ... + 14070.
2856440 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 856440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562400).
856440 is an abundant number, since it is smaller than the sum of its proper divisors (2268360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
856440 is a wasteful number, since it uses less digits than its factorization.
856440 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 94 (or 84 counting only the distinct ones).
The product of its (nonzero) digits is 3840, while the sum is 27.
The square root of 856440 is about 925.4404356845. The cubic root of 856440 is about 94.9654537363.
It can be divided in two parts, 856 and 440, that added together give a 4-th power (1296 = 64).
The spelling of 856440 in words is "eight hundred fifty-six thousand, four hundred forty".
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