84138449 has 2 divisors, whose sum is σ = 84138450. Its totient is φ = 84138448.

The previous prime is 84138419. The next prime is 84138497. The reversal of 84138449 is 94483148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72982849 + 11155600 = 8543^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 84138449 - 2¹² = 84134353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84138409) 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, 42069224 + 42069225.

It is an arithmetic number, because the mean of its divisors is an integer number (42069225).

Almost surely, 2^84138449 is an apocalyptic number.

It is an amenable number.

84138449 is a deficient number, since it is larger than the sum of its proper divisors (1).

84138449 is an equidigital number, since it uses as much as digits as its factorization.

84138449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 41.

The square root of 84138449 is about 9172.7012924220. The cubic root of 84138449 is about 438.1923930469.

The spelling of 84138449 in words is "eighty-four million, one hundred thirty-eight thousand, four hundred forty-nine".