2779949 has 2 divisors, whose sum is σ = 2779950. Its totient is φ = 2779948.

The previous prime is 2779943. The next prime is 2779961. The reversal of 2779949 is 9499772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2280100 + 499849 = 1510^2 + 707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2779949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2779943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389974 + 1389975.

It is an arithmetic number, because the mean of its divisors is an integer number (1389975).

2^2779949 is an apocalyptic number.

It is an amenable number.

2779949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2779949 is an equidigital number, since it uses as much as digits as its factorization.

2779949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 47.

The square root of 2779949 is about 1667.3179060995. The cubic root of 2779949 is about 140.6087269400.

The spelling of 2779949 in words is "two million, seven hundred seventy-nine thousand, nine hundred forty-nine".