2643889 has 2 divisors, whose sum is σ = 2643890. Its totient is φ = 2643888.

The previous prime is 2643871. The next prime is 2643899. The reversal of 2643889 is 9883462.

2643889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1520289 + 1123600 = 1233^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643889 - 2¹¹ = 2641841 is a prime.

It is not a weakly prime, because it can be changed into another prime (2643899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321944 + 1321945.

It is an arithmetic number, because the mean of its divisors is an integer number (1321945).

2^2643889 is an apocalyptic number.

It is an amenable number.

2643889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643889 is an equidigital number, since it uses as much as digits as its factorization.

2643889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 2643889 is about 1626.0039975351. The cubic root of 2643889 is about 138.2762965455.

The spelling of 2643889 in words is "two million, six hundred forty-three thousand, eight hundred eighty-nine".