138600065 has 12 divisors (see below), whose sum is σ = 176680956. Its totient is φ = 104356608.

The previous prime is 138600061. The next prime is 138600073. The reversal of 138600065 is 560006831.

It can be written as a sum of positive squares in 6 ways, for example, as 9709456 + 128890609 = 3116^2 + 11353^2 .

It is not a de Polignac number, because 138600065 - 2² = 138600061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138600061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46514 + ... + 49403.

It is an arithmetic number, because the mean of its divisors is an integer number (14723413).

Almost surely, 2^138600065 is an apocalyptic number.

It is an amenable number.

138600065 is a deficient number, since it is larger than the sum of its proper divisors (38080891).

138600065 is an equidigital number, since it uses as much as digits as its factorization.

138600065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95956 (or 95939 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 138600065 is about 11772.8528827978. The cubic root of 138600065 is about 517.5128580125.

Adding to 138600065 its reverse (560006831), we get a palindrome (698606896).

The spelling of 138600065 in words is "one hundred thirty-eight million, six hundred thousand, sixty-five".