2778049 has 2 divisors, whose sum is σ = 2778050. Its totient is φ = 2778048.

The previous prime is 2778023. The next prime is 2778067. The reversal of 2778049 is 9408772.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2745649 + 32400 = 1657^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778049 - 2⁷ = 2777921 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2777999 and 2778017.

It is not a weakly prime, because it can be changed into another prime (2778019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389024 + 1389025.

It is an arithmetic number, because the mean of its divisors is an integer number (1389025).

2^2778049 is an apocalyptic number.

It is an amenable number.

2778049 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778049 is an equidigital number, since it uses as much as digits as its factorization.

2778049 is an evil number, because the sum of its binary digits is even.

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

The square root of 2778049 is about 1666.7480313473. The cubic root of 2778049 is about 140.5766858884.

The spelling of 2778049 in words is "two million, seven hundred seventy-eight thousand, forty-nine".