84409439 has 2 divisors, whose sum is σ = 84409440. Its totient is φ = 84409438.

The previous prime is 84409417. The next prime is 84409441. The reversal of 84409439 is 93490448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84409439 - 2²⁰ = 83360863 is a prime.

Together with 84409441, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84409396 and 84409405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84409139) 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, 42204719 + 42204720.

It is an arithmetic number, because the mean of its divisors is an integer number (42204720).

Almost surely, 2^84409439 is an apocalyptic number.

84409439 is a deficient number, since it is larger than the sum of its proper divisors (1).

84409439 is an equidigital number, since it uses as much as digits as its factorization.

84409439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 84409439 is about 9187.4609659035. The cubic root of 84409439 is about 438.6623268352.

It can be divided in two parts, 84409 and 439, that added together give a palindrome (84848).

The spelling of 84409439 in words is "eighty-four million, four hundred nine thousand, four hundred thirty-nine".