84384509 has 4 divisors (see below), whose sum is σ = 92055840. Its totient is φ = 76713180.

The previous prime is 84384499. The next prime is 84384527. The reversal of 84384509 is 90548348.

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 not a de Polignac number, because 84384509 - 2⁸ = 84384253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84384589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3835649 + ... + 3835670.

It is an arithmetic number, because the mean of its divisors is an integer number (23013960).

Almost surely, 2^84384509 is an apocalyptic number.

It is an amenable number.

84384509 is a deficient number, since it is larger than the sum of its proper divisors (7671331).

84384509 is a wasteful number, since it uses less digits than its factorization.

84384509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7671330.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 84384509 is about 9186.1041252535. The cubic root of 84384509 is about 438.6191368447.

The spelling of 84384509 in words is "eighty-four million, three hundred eighty-four thousand, five hundred nine".