2778229 has 4 divisors (see below), whose sum is σ = 2874060. Its totient is φ = 2682400.

The previous prime is 2778227. The next prime is 2778233. The reversal of 2778229 is 9228772.

2778229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1782225 + 996004 = 1335^2 + 998^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778229 - 2¹ = 2778227 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47872 + ... + 47929.

It is an arithmetic number, because the mean of its divisors is an integer number (718515).

2^2778229 is an apocalyptic number.

2778229 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2778229 is a deficient number, since it is larger than the sum of its proper divisors (95831).

2778229 is an equidigital number, since it uses as much as digits as its factorization.

2778229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95830.

The product of its digits is 28224, while the sum is 37.

The square root of 2778229 is about 1666.8020278365. The cubic root of 2778229 is about 140.5797219828.

The spelling of 2778229 in words is "two million, seven hundred seventy-eight thousand, two hundred twenty-nine".