2856321 has 12 divisors (see below), whose sum is σ = 4443348. Its totient is φ = 1757664.

The previous prime is 2856283. The next prime is 2856349. The reversal of 2856321 is 1236582.

2856321 is a `hidden beast` number, since 28 + 5 + 632 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 497025 + 2359296 = 705^2 + 1536^2 .

It is not a de Polignac number, because 2856321 - 2¹¹ = 2854273 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2856121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12090 + ... + 12323.

It is an arithmetic number, because the mean of its divisors is an integer number (370279).

2^2856321 is an apocalyptic number.

It is an amenable number.

2856321 is a deficient number, since it is larger than the sum of its proper divisors (1587027).

2856321 is a wasteful number, since it uses less digits than its factorization.

2856321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24432 (or 24429 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2856321 is about 1690.0653833506. The cubic root of 2856321 is about 141.8847342063.

The spelling of 2856321 in words is "two million, eight hundred fifty-six thousand, three hundred twenty-one".