138209876 has 48 divisors (see below), whose sum is σ = 292454400. Its totient is φ = 55829088.

The previous prime is 138209839. The next prime is 138209891. The reversal of 138209876 is 678902831.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 126605 + ... + 127691.

It is an arithmetic number, because the mean of its divisors is an integer number (6092800).

Almost surely, 2^138209876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138209876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146227200).

138209876 is an abundant number, since it is smaller than the sum of its proper divisors (154244524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138209876 is a wasteful number, since it uses less digits than its factorization.

138209876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 138209876 is about 11756.2696464482. The cubic root of 138209876 is about 517.0267648986.

The spelling of 138209876 in words is "one hundred thirty-eight million, two hundred nine thousand, eight hundred seventy-six".