84505439 has 2 divisors, whose sum is σ = 84505440. Its totient is φ = 84505438.

The previous prime is 84505433. The next prime is 84505451. The reversal of 84505439 is 93450548.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84505439 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84505433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42252719 + 42252720.

It is an arithmetic number, because the mean of its divisors is an integer number (42252720).

Almost surely, 2^84505439 is an apocalyptic number.

84505439 is a deficient number, since it is larger than the sum of its proper divisors (1).

84505439 is an equidigital number, since it uses as much as digits as its factorization.

84505439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 84505439 is about 9192.6839932633. The cubic root of 84505439 is about 438.8285627019.

The spelling of 84505439 in words is "eighty-four million, five hundred five thousand, four hundred thirty-nine".