138335885 has 8 divisors (see below), whose sum is σ = 175768056. Its totient is φ = 104158720.

The previous prime is 138335867. The next prime is 138335909. The reversal of 138335885 is 588533831.

It can be written as a sum of positive squares in 4 ways, for example, as 29571844 + 108764041 = 5438^2 + 10429^2 .

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

It is not a de Polignac number, because 138335885 - 2¹⁴ = 138319501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813656 + ... + 813825.

It is an arithmetic number, because the mean of its divisors is an integer number (21971007).

Almost surely, 2^138335885 is an apocalyptic number.

It is an amenable number.

138335885 is a deficient number, since it is larger than the sum of its proper divisors (37432171).

138335885 is a wasteful number, since it uses less digits than its factorization.

138335885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627503.

The product of its digits is 345600, while the sum is 44.

The square root of 138335885 is about 11761.6276509674. The cubic root of 138335885 is about 517.1838454149.

The spelling of 138335885 in words is "one hundred thirty-eight million, three hundred thirty-five thousand, eight hundred eighty-five".