2778849 has 6 divisors (see below), whose sum is σ = 4013906. Its totient is φ = 1852560.

The previous prime is 2778833. The next prime is 2778851. The reversal of 2778849 is 9488772.

2778849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2624400 + 154449 = 1620^2 + 393^2 .

It is not a de Polignac number, because 2778849 - 2⁴ = 2778833 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 7⁵ + 7⁶ + 8 + 8⁷ + 4⁷ + 9⁴ .

It is a Duffinian number.

2778849 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2778829) 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 5 ways as a sum of consecutive naturals, for example, 154372 + ... + 154389.

2^2778849 is an apocalyptic number.

It is an amenable number.

2778849 is a deficient number, since it is larger than the sum of its proper divisors (1235057).

2778849 is a wasteful number, since it uses less digits than its factorization.

2778849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308767 (or 308764 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 2778849 is about 1666.9880023563. The cubic root of 2778849 is about 140.5901786376.

The spelling of 2778849 in words is "two million, seven hundred seventy-eight thousand, eight hundred forty-nine".