84444391 has 2 divisors, whose sum is σ = 84444392. Its totient is φ = 84444390.

The previous prime is 84444361. The next prime is 84444439. The reversal of 84444391 is 19344448.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84444391 - 2⁷ = 84444263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84444391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84444331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42222195 + 42222196.

It is an arithmetic number, because the mean of its divisors is an integer number (42222196).

Almost surely, 2^84444391 is an apocalyptic number.

84444391 is a deficient number, since it is larger than the sum of its proper divisors (1).

84444391 is an equidigital number, since it uses as much as digits as its factorization.

84444391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 37.

The square root of 84444391 is about 9189.3629267757. The cubic root of 84444391 is about 438.7228651276.

The spelling of 84444391 in words is "eighty-four million, four hundred forty-four thousand, three hundred ninety-one".