6446789 has 2 divisors, whose sum is σ = 6446790. Its totient is φ = 6446788.

The previous prime is 6446777. The next prime is 6446801. The reversal of 6446789 is 9876446.

It is a balanced prime because it is at equal distance from previous prime (6446777) and next prime (6446801).

It can be written as a sum of positive squares in only one way, i.e., 6300100 + 146689 = 2510^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 6446789 - 2⁸ = 6446533 is a prime.

It is a super-2 number, since 2×6446789² = 83122176821042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6446189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3223394 + 3223395.

It is an arithmetic number, because the mean of its divisors is an integer number (3223395).

Almost surely, 2^6446789 is an apocalyptic number.

It is an amenable number.

6446789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6446789 is an equidigital number, since it uses as much as digits as its factorization.

6446789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 6446789 is about 2539.0527761352. The cubic root of 6446789 is about 186.1149037584.

The spelling of 6446789 in words is "six million, four hundred forty-six thousand, seven hundred eighty-nine".