84138665 has 16 divisors (see below), whose sum is σ = 109074000. Its totient is φ = 61938432.

The previous prime is 84138641. The next prime is 84138679. The reversal of 84138665 is 56683148.

It can be written as a sum of positive squares in 8 ways, for example, as 5851561 + 78287104 = 2419^2 + 8848^2 .

It is a cyclic number.

It is not a de Polignac number, because 84138665 - 2⁸ = 84138409 is a prime.

It is an unprimeable number.

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, 20831 + ... + 24539.

It is an arithmetic number, because the mean of its divisors is an integer number (6817125).

Almost surely, 2^84138665 is an apocalyptic number.

It is an amenable number.

84138665 is a deficient number, since it is larger than the sum of its proper divisors (24935335).

84138665 is a wasteful number, since it uses less digits than its factorization.

84138665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076.

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

The square root of 84138665 is about 9172.7130664815. The cubic root of 84138665 is about 438.1927680220.

The spelling of 84138665 in words is "eighty-four million, one hundred thirty-eight thousand, six hundred sixty-five".