138538876 has 54 divisors (see below), whose sum is σ = 293063904. Its totient is φ = 57078000.

The previous prime is 138538853. The next prime is 138538879. The reversal of 138538876 is 678835831.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138538879) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 917401 + ... + 917551.

Almost surely, 2^138538876 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 138538876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146531952).

138538876 is an abundant number, since it is smaller than the sum of its proper divisors (154525028).

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

138538876 is a wasteful number, since it uses less digits than its factorization.

138538876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 191 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The square root of 138538876 is about 11770.2538630227. The cubic root of 138538876 is about 517.4366898054.

The spelling of 138538876 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, eight hundred seventy-six".