2782813 has 4 divisors (see below), whose sum is σ = 3035808. Its totient is φ = 2529820.

The previous prime is 2782789. The next prime is 2782841. The reversal of 2782813 is 3182872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2782813 - 2¹⁷ = 2651741 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2782613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126481 + ... + 126502.

It is an arithmetic number, because the mean of its divisors is an integer number (758952).

2^2782813 is an apocalyptic number.

It is an amenable number.

2782813 is a deficient number, since it is larger than the sum of its proper divisors (252995).

2782813 is a wasteful number, since it uses less digits than its factorization.

2782813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252994.

The product of its digits is 5376, while the sum is 31.

The square root of 2782813 is about 1668.1765494096. The cubic root of 2782813 is about 140.6569970318.

The spelling of 2782813 in words is "two million, seven hundred eighty-two thousand, eight hundred thirteen".