84384409 has 4 divisors (see below), whose sum is σ = 84468240. Its totient is φ = 84300580.

The previous prime is 84384367. The next prime is 84384431. The reversal of 84384409 is 90448348.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84384409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84384479) 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 in 3 ways as a sum of consecutive naturals, for example, 40387 + ... + 42424.

It is an arithmetic number, because the mean of its divisors is an integer number (21117060).

Almost surely, 2^84384409 is an apocalyptic number.

It is an amenable number.

84384409 is a deficient number, since it is larger than the sum of its proper divisors (83831).

84384409 is a wasteful number, since it uses less digits than its factorization.

84384409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83830.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 84384409 is about 9186.0986822481. The cubic root of 84384409 is about 438.6189635825.

The spelling of 84384409 in words is "eighty-four million, three hundred eighty-four thousand, four hundred nine".