84309439 has 2 divisors, whose sum is σ = 84309440. Its totient is φ = 84309438.

The previous prime is 84309437. The next prime is 84309451. The reversal of 84309439 is 93490348.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84309439 - 2¹ = 84309437 is a prime.

Together with 84309437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84309431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42154719 + 42154720.

It is an arithmetic number, because the mean of its divisors is an integer number (42154720).

Almost surely, 2^84309439 is an apocalyptic number.

84309439 is a deficient number, since it is larger than the sum of its proper divisors (1).

84309439 is an equidigital number, since it uses as much as digits as its factorization.

84309439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 84309439 is about 9182.0171531097. The cubic root of 84309439 is about 438.4890303910.

It can be divided in two parts, 84309 and 439, that added together give a palindrome (84748).

The spelling of 84309439 in words is "eighty-four million, three hundred nine thousand, four hundred thirty-nine".