2643779 has 2 divisors, whose sum is σ = 2643780. Its totient is φ = 2643778.

The previous prime is 2643757. The next prime is 2643791. The reversal of 2643779 is 9773462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2643779 - 2⁸ = 2643523 is a prime.

It is not a weakly prime, because it can be changed into another prime (2643709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321889 + 1321890.

It is an arithmetic number, because the mean of its divisors is an integer number (1321890).

2^2643779 is an apocalyptic number.

2643779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643779 is an equidigital number, since it uses as much as digits as its factorization.

2643779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 2643779 is about 1625.9701719281. The cubic root of 2643779 is about 138.2743788397.

The spelling of 2643779 in words is "two million, six hundred forty-three thousand, seven hundred seventy-nine".