2778799 has 2 divisors, whose sum is σ = 2778800. Its totient is φ = 2778798.

The previous prime is 2778793. The next prime is 2778823. The reversal of 2778799 is 9978772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2778799 - 2¹¹ = 2776751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389399 + 1389400.

It is an arithmetic number, because the mean of its divisors is an integer number (1389400).

2^2778799 is an apocalyptic number.

2778799 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778799 is an equidigital number, since it uses as much as digits as its factorization.

2778799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 49.

The square root of 2778799 is about 1666.9730051803. The cubic root of 2778799 is about 140.5893354166.

The spelling of 2778799 in words is "two million, seven hundred seventy-eight thousand, seven hundred ninety-nine".