6439427 has 2 divisors, whose sum is σ = 6439428. Its totient is φ = 6439426.

The previous prime is 6439397. The next prime is 6439439. The reversal of 6439427 is 7249346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6439427 - 2⁸ = 6439171 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁷ + 4² + 3⁶ + 9³ + 4⁹ + 2¹⁷ + 7⁸ .

It is not a weakly prime, because it can be changed into another prime (6439127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219713 + 3219714.

It is an arithmetic number, because the mean of its divisors is an integer number (3219714).

Almost surely, 2^6439427 is an apocalyptic number.

6439427 is a deficient number, since it is larger than the sum of its proper divisors (1).

6439427 is an equidigital number, since it uses as much as digits as its factorization.

6439427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 35.

The square root of 6439427 is about 2537.6026087628. The cubic root of 6439427 is about 186.0440312762.

The spelling of 6439427 in words is "six million, four hundred thirty-nine thousand, four hundred twenty-seven".