2778697 has 2 divisors, whose sum is σ = 2778698. Its totient is φ = 2778696.

The previous prime is 2778689. The next prime is 2778739. The reversal of 2778697 is 7968772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2768896 + 9801 = 1664^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778697 - 2³ = 2778689 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2778647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389348 + 1389349.

It is an arithmetic number, because the mean of its divisors is an integer number (1389349).

2^2778697 is an apocalyptic number.

It is an amenable number.

2778697 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778697 is an equidigital number, since it uses as much as digits as its factorization.

2778697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 46.

The square root of 2778697 is about 1666.9424105229. The cubic root of 2778697 is about 140.5876152145.

The spelling of 2778697 in words is "two million, seven hundred seventy-eight thousand, six hundred ninety-seven".