84445391 has 8 divisors (see below), whose sum is σ = 86092800. Its totient is φ = 82812600.

The previous prime is 84445379. The next prime is 84445423. The reversal of 84445391 is 19354448.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84445391 - 2⁶ = 84445327 is a prime.

It is a super-2 number, since 2×84445391² = 14262048122285762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84445301) 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 in 7 ways as a sum of consecutive naturals, for example, 8390 + ... + 15468.

It is an arithmetic number, because the mean of its divisors is an integer number (10761600).

Almost surely, 2^84445391 is an apocalyptic number.

84445391 is a deficient number, since it is larger than the sum of its proper divisors (1647409).

84445391 is a wasteful number, since it uses less digits than its factorization.

84445391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7309.

The product of its digits is 69120, while the sum is 38.

The square root of 84445391 is about 9189.4173373506. The cubic root of 84445391 is about 438.7245969226.

The spelling of 84445391 in words is "eighty-four million, four hundred forty-five thousand, three hundred ninety-one".