2785863 has 4 divisors (see below), whose sum is σ = 3714488. Its totient is φ = 1857240.

The previous prime is 2785859. The next prime is 2785873. The reversal of 2785863 is 3685872.

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

It is not a de Polignac number, because 2785863 - 2² = 2785859 is a prime.

It is a super-2 number, since 2×2785863² = 15522065309538, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

2785863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2785813) 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, 464308 + ... + 464313.

It is an arithmetic number, because the mean of its divisors is an integer number (928622).

2^2785863 is an apocalyptic number.

2785863 is a deficient number, since it is larger than the sum of its proper divisors (928625).

2785863 is an equidigital number, since it uses as much as digits as its factorization.

2785863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928624.

The product of its digits is 80640, while the sum is 39.

The square root of 2785863 is about 1669.0904708853. The cubic root of 2785863 is about 140.7083655816.

Subtracting 2785863 from its reverse (3685872), we obtain a palindrome (900009).

The spelling of 2785863 in words is "two million, seven hundred eighty-five thousand, eight hundred sixty-three".