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2806 = 22361
BaseRepresentation
bin101011110110
310211221
4223312
542211
620554
711116
oct5366
93757
102806
112121
12175a
13137b
141046
15c71
hexaf6

2806 has 8 divisors (see below), whose sum is σ = 4464. Its totient is φ = 1320.

The previous prime is 2803. The next prime is 2819. The reversal of 2806 is 6082.

Adding to 2806 its reverse (6082), we get a palindrome (8888).

It can be divided in two parts, 2 and 806, that added together give a palindrome (808).

2806 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

2806 is an undulating number in base 11.

It is a plaindrome in base 7 and base 13.

It is a nialpdrome in base 5 and base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 2806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16 + ... + 76.

It is an arithmetic number, because the mean of its divisors is an integer number (558).

2806 is the 34-th centered pentagonal number.

2806 is a deficient number, since it is larger than the sum of its proper divisors (1658).

2806 is a wasteful number, since it uses less digits than its factorization.

2806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2806 is about 52.9716905526. The cubic root of 2806 is about 14.1046578512.

The spelling of 2806 in words is "two thousand, eight hundred six".

Divisors: 1 2 23 46 61 122 1403 2806