64439 has 2 divisors, whose sum is σ = 64440. Its totient is φ = 64438.

The previous prime is 64433. The next prime is 64451. The reversal of 64439 is 93446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64439 - 2¹² = 60343 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64433) 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, 32219 + 32220.

It is an arithmetic number, because the mean of its divisors is an integer number (32220).

2⁶⁴⁴³⁹ is an apocalyptic number.

64439 is a deficient number, since it is larger than the sum of its proper divisors (1).

64439 is an equidigital number, since it uses as much as digits as its factorization.

64439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 64439 is about 253.8483799436. The cubic root of 64439 is about 40.0912500109.

The spelling of 64439 in words is "sixty-four thousand, four hundred thirty-nine".