6649387 has 2 divisors, whose sum is σ = 6649388. Its totient is φ = 6649386.

The previous prime is 6649367. The next prime is 6649393. The reversal of 6649387 is 7839466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6649387 - 2¹¹ = 6647339 is a prime.

It is a d-powerful number, because it can be written as 6⁵ + 6⁸ + 4⁵ + 9⁷ + 3¹¹ + 8³ + 7³ .

It is not a weakly prime, because it can be changed into another prime (6649337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324693 + 3324694.

It is an arithmetic number, because the mean of its divisors is an integer number (3324694).

Almost surely, 2^6649387 is an apocalyptic number.

6649387 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649387 is an equidigital number, since it uses as much as digits as its factorization.

6649387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 6649387 is about 2578.6405333043. The cubic root of 6649387 is about 188.0444571940.

The spelling of 6649387 in words is "six million, six hundred forty-nine thousand, three hundred eighty-seven".