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2818 = 21409
BaseRepresentation
bin101100000010
310212101
4230002
542233
621014
711134
oct5402
93771
102818
112132
12176a
13138a
141054
15c7d
hexb02

2818 has 4 divisors (see below), whose sum is σ = 4230. Its totient is φ = 1408.

The previous prime is 2803. The next prime is 2819. The reversal of 2818 is 8182.

It can be divided in two parts, 281 and 8, that added together give a square (289 = 172).

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8182 = 24091.

It can be written as a sum of positive squares in only one way, i.e., 2809 + 9 = 53^2 + 3^2 .

It is a super-2 number, since 2×28182 = 15882248, which contains 22 as substring.

It is a plaindrome in base 7 and base 13.

It is a junction number, because it is equal to n+sod(n) for n = 2795 and 2804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703 + ... + 706.

22818 is an apocalyptic number.

2818 is a deficient number, since it is larger than the sum of its proper divisors (1412).

2818 is a wasteful number, since it uses less digits than its factorization.

2818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411.

The product of its digits is 128, while the sum is 19.

The square root of 2818 is about 53.0848377599. The cubic root of 2818 is about 14.1247356830.

The spelling of 2818 in words is "two thousand, eight hundred eighteen".

Divisors: 1 2 1409 2818