84389665 has 4 divisors (see below), whose sum is σ = 101267604. Its totient is φ = 67511728.

The previous prime is 84389663. The next prime is 84389687. The reversal of 84389665 is 56698348.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63632529 + 20757136 = 7977^2 + 4556^2 .

It is a cyclic number.

It is not a de Polignac number, because 84389665 - 2¹ = 84389663 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84389663) 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, 8438962 + ... + 8438971.

It is an arithmetic number, because the mean of its divisors is an integer number (25316901).

Almost surely, 2^84389665 is an apocalyptic number.

It is an amenable number.

84389665 is a deficient number, since it is larger than the sum of its proper divisors (16877939).

84389665 is a wasteful number, since it uses less digits than its factorization.

84389665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16877938.

The product of its digits is 1244160, while the sum is 49.

The square root of 84389665 is about 9186.3847622446. The cubic root of 84389665 is about 438.6280700570.

The spelling of 84389665 in words is "eighty-four million, three hundred eighty-nine thousand, six hundred sixty-five".