138361865 has 8 divisors (see below), whose sum is σ = 166328448. Its totient is φ = 110493360.

The previous prime is 138361849. The next prime is 138361879. The reversal of 138361865 is 568163831.

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

It is not a de Polignac number, because 138361865 - 2⁴ = 138361849 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 21377 + ... + 27086.

It is an arithmetic number, because the mean of its divisors is an integer number (20791056).

Almost surely, 2^138361865 is an apocalyptic number.

It is an amenable number.

138361865 is a deficient number, since it is larger than the sum of its proper divisors (27966583).

138361865 is an equidigital number, since it uses as much as digits as its factorization.

138361865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49039.

The product of its digits is 103680, while the sum is 41.

The square root of 138361865 is about 11762.7320380939. The cubic root of 138361865 is about 517.2162197461.

The spelling of 138361865 in words is "one hundred thirty-eight million, three hundred sixty-one thousand, eight hundred sixty-five".