84538509 has 16 divisors (see below), whose sum is σ = 127206720. Its totient is φ = 49468160.

The previous prime is 84538481. The next prime is 84538513. The reversal of 84538509 is 90583548.

It is a cyclic number.

It is not a de Polignac number, because 84538509 - 2⁷ = 84538381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84538529) 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 15 ways as a sum of consecutive naturals, for example, 43212 + ... + 45125.

It is an arithmetic number, because the mean of its divisors is an integer number (7950420).

Almost surely, 2^84538509 is an apocalyptic number.

It is an amenable number.

84538509 is a deficient number, since it is larger than the sum of its proper divisors (42668211).

84538509 is a wasteful number, since it uses less digits than its factorization.

84538509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88380.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 84538509 is about 9194.4825303004. The cubic root of 84538509 is about 438.8857983391.

The spelling of 84538509 in words is "eighty-four million, five hundred thirty-eight thousand, five hundred nine".