84189009 has 4 divisors (see below), whose sum is σ = 112252016. Its totient is φ = 56126004.

The previous prime is 84188999. The next prime is 84189013. The reversal of 84189009 is 90098148.

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 not a de Polignac number, because 84189009 - 2⁵ = 84188977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84189029) 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, 14031499 + ... + 14031504.

It is an arithmetic number, because the mean of its divisors is an integer number (28063004).

Almost surely, 2^84189009 is an apocalyptic number.

It is an amenable number.

84189009 is a deficient number, since it is larger than the sum of its proper divisors (28063007).

84189009 is a wasteful number, since it uses less digits than its factorization.

84189009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28063006.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 84189009 is about 9175.4568823574. The cubic root of 84189009 is about 438.2801475015.

The spelling of 84189009 in words is "eighty-four million, one hundred eighty-nine thousand, nine".