856424 has 8 divisors (see below), whose sum is σ = 1605810. Its totient is φ = 428208.

The previous prime is 856421. The next prime is 856441. The reversal of 856424 is 424658.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 232324 = 790^2 + 482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (856421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53519 + ... + 53534.

2⁸⁵⁶⁴²⁴ is an apocalyptic number.

It is an amenable number.

856424 is a deficient number, since it is larger than the sum of its proper divisors (749386).

856424 is a wasteful number, since it uses less digits than its factorization.

856424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107059 (or 107055 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 856424 is about 925.4317911116. The cubic root of 856424 is about 94.9648623515.

The spelling of 856424 in words is "eight hundred fifty-six thousand, four hundred twenty-four".