6699439 has 2 divisors, whose sum is σ = 6699440. Its totient is φ = 6699438.

The previous prime is 6699421. The next prime is 6699481. The reversal of 6699439 is 9349966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6699439 - 2⁷ = 6699311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6699839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3349719 + 3349720.

It is an arithmetic number, because the mean of its divisors is an integer number (3349720).

Almost surely, 2^6699439 is an apocalyptic number.

6699439 is a deficient number, since it is larger than the sum of its proper divisors (1).

6699439 is an equidigital number, since it uses as much as digits as its factorization.

6699439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 46.

The square root of 6699439 is about 2588.3274522363. The cubic root of 6699439 is about 188.5151012675.

The spelling of 6699439 in words is "six million, six hundred ninety-nine thousand, four hundred thirty-nine".