Search a number
-
+
2807 = 7401
BaseRepresentation
bin101011110111
310211222
4223313
542212
620555
711120
oct5367
93758
102807
112122
12175b
13137c
141047
15c72
hexaf7

2807 has 4 divisors (see below), whose sum is σ = 3216. Its totient is φ = 2400.

The previous prime is 2803. The next prime is 2819. The reversal of 2807 is 7082.

Adding to 2807 its reverse (7082), we get a palindrome (9889).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7082 = 23541.

It is a cyclic number.

It is not a de Polignac number, because 2807 - 22 = 2803 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 15.

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, 194 + ... + 207.

It is an arithmetic number, because the mean of its divisors is an integer number (804).

2807 is a deficient number, since it is larger than the sum of its proper divisors (409).

2807 is an equidigital number, since it uses as much as digits as its factorization.

2807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 2807 is about 52.9811287158. The cubic root of 2807 is about 14.1063331877.

The spelling of 2807 in words is "two thousand, eight hundred seven".

Divisors: 1 7 401 2807