6408749 has 2 divisors, whose sum is σ = 6408750. Its totient is φ = 6408748.

The previous prime is 6408713. The next prime is 6408769. The reversal of 6408749 is 9478046.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6375625 + 33124 = 2525^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 6408749 - 2¹⁶ = 6343213 is a prime.

It is equal to p₄₃₈₉₅₉ and since 6408749 and 438959 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 (6408709) 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, 3204374 + 3204375.

It is an arithmetic number, because the mean of its divisors is an integer number (3204375).

Almost surely, 2^6408749 is an apocalyptic number.

It is an amenable number.

6408749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6408749 is an equidigital number, since it uses as much as digits as its factorization.

6408749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 6408749 is about 2531.5507105330. The cubic root of 6408749 is about 185.7481174488.

The spelling of 6408749 in words is "six million, four hundred eight thousand, seven hundred forty-nine".