2813863 has 4 divisors (see below), whose sum is σ = 3030328. Its totient is φ = 2597400.

The previous prime is 2813851. The next prime is 2813879. The reversal of 2813863 is 3683182.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-2813863 is a prime.

It is an Ulam number.

It is a Duffinian number.

2813863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2813563) 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, 108213 + ... + 108238.

It is an arithmetic number, because the mean of its divisors is an integer number (757582).

2^2813863 is an apocalyptic number.

2813863 is a deficient number, since it is larger than the sum of its proper divisors (216465).

2813863 is a wasteful number, since it uses less digits than its factorization.

2813863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216464.

The product of its digits is 6912, while the sum is 31.

The square root of 2813863 is about 1677.4573019901. The cubic root of 2813863 is about 141.1782029982.

The spelling of 2813863 in words is "two million, eight hundred thirteen thousand, eight hundred sixty-three".