2787223 has 4 divisors (see below), whose sum is σ = 2820888. Its totient is φ = 2753560.

The previous prime is 2787181. The next prime is 2787227. The reversal of 2787223 is 3227872.

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

It is a cyclic number.

It is not a de Polignac number, because 2787223 - 2¹³ = 2779031 is a prime.

It is a super-2 number, since 2×2787223² = 15537224103458, which contains 22 as substring.

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 (2787227) 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, 16708 + ... + 16873.

It is an arithmetic number, because the mean of its divisors is an integer number (705222).

2^2787223 is an apocalyptic number.

2787223 is a deficient number, since it is larger than the sum of its proper divisors (33665).

2787223 is an equidigital number, since it uses as much as digits as its factorization.

2787223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33664.

The product of its digits is 9408, while the sum is 31.

The square root of 2787223 is about 1669.4978286898. The cubic root of 2787223 is about 140.7312588162.

The spelling of 2787223 in words is "two million, seven hundred eighty-seven thousand, two hundred twenty-three".