138616865 has 8 divisors (see below), whose sum is σ = 169879680. Its totient is φ = 108533872.

The previous prime is 138616843. The next prime is 138616879. The reversal of 138616865 is 568616831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138616865 - 2⁶ = 138616801 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294695 + ... + 295164.

It is an arithmetic number, because the mean of its divisors is an integer number (21234960).

Almost surely, 2^138616865 is an apocalyptic number.

It is an amenable number.

138616865 is a deficient number, since it is larger than the sum of its proper divisors (31262815).

138616865 is an equidigital number, since it uses as much as digits as its factorization.

138616865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589911.

The product of its digits is 207360, while the sum is 44.

The square root of 138616865 is about 11773.5663670784. The cubic root of 138616865 is about 517.5337667683.

The spelling of 138616865 in words is "one hundred thirty-eight million, six hundred sixteen thousand, eight hundred sixty-five".