6738649 has 2 divisors, whose sum is σ = 6738650. Its totient is φ = 6738648.

The previous prime is 6738631. The next prime is 6738689. The reversal of 6738649 is 9468376.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 4624 = 2595^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 6738649 - 2¹⁹ = 6214361 is a prime.

It is equal to p₄₅₉₉₈₈ and since 6738649 and 459988 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6738689) 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, 3369324 + 3369325.

It is an arithmetic number, because the mean of its divisors is an integer number (3369325).

Almost surely, 2^6738649 is an apocalyptic number.

It is an amenable number.

6738649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6738649 is an equidigital number, since it uses as much as digits as its factorization.

6738649 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 6738649 is about 2595.8907912314. The cubic root of 6738649 is about 188.8821620185.

The spelling of 6738649 in words is "six million, seven hundred thirty-eight thousand, six hundred forty-nine".