138209875 has 16 divisors (see below), whose sum is σ = 179989056. Its totient is φ = 105758400.

The previous prime is 138209839. The next prime is 138209891. The reversal of 138209875 is 578902831.

138209875 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138209875 - 2¹⁵ = 138177107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21162 + ... + 26911.

It is an arithmetic number, because the mean of its divisors is an integer number (11249316).

Almost surely, 2^138209875 is an apocalyptic number.

138209875 is a deficient number, since it is larger than the sum of its proper divisors (41779181).

138209875 is an equidigital number, since it uses as much as digits as its factorization.

138209875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48111 (or 48101 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 138209875 is about 11756.2696039177. The cubic root of 138209875 is about 517.0267636516.

The spelling of 138209875 in words is "one hundred thirty-eight million, two hundred nine thousand, eight hundred seventy-five".