64842439 has 2 divisors, whose sum is σ = 64842440. Its totient is φ = 64842438.

The previous prime is 64842433. The next prime is 64842457. The reversal of 64842439 is 93424846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64842439 - 2³ = 64842431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64842431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32421219 + 32421220.

It is an arithmetic number, because the mean of its divisors is an integer number (32421220).

Almost surely, 2^64842439 is an apocalyptic number.

64842439 is a deficient number, since it is larger than the sum of its proper divisors (1).

64842439 is an equidigital number, since it uses as much as digits as its factorization.

64842439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 40.

The square root of 64842439 is about 8052.4803011246. The cubic root of 64842439 is about 401.7474362996.

The spelling of 64842439 in words is "sixty-four million, eight hundred forty-two thousand, four hundred thirty-nine".