2778439 has 2 divisors, whose sum is σ = 2778440. Its totient is φ = 2778438.

The previous prime is 2778421. The next prime is 2778467. The reversal of 2778439 is 9348772.

2778439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2778439 - 2¹⁷ = 2647367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778539) 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 as a sum of consecutive naturals, namely, 1389219 + 1389220.

It is an arithmetic number, because the mean of its divisors is an integer number (1389220).

2^2778439 is an apocalyptic number.

2778439 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778439 is an equidigital number, since it uses as much as digits as its factorization.

2778439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 2778439 is about 1666.8650215299. The cubic root of 2778439 is about 140.5832639271.

The spelling of 2778439 in words is "two million, seven hundred seventy-eight thousand, four hundred thirty-nine".