138188512 has 96 divisors (see below), whose sum is σ = 359251200. Its totient is φ = 50657280.

The previous prime is 138188473. The next prime is 138188521. The reversal of 138188512 is 215881831.

It is a congruent 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, 40239 + ... + 43537.

It is an arithmetic number, because the mean of its divisors is an integer number (3742200).

Almost surely, 2^138188512 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 138188512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179625600).

138188512 is an abundant number, since it is smaller than the sum of its proper divisors (221062688).

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

138188512 is a wasteful number, since it uses less digits than its factorization.

138188512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344 (or 3336 counting only the distinct ones).

The product of its digits is 15360, while the sum is 37.

The square root of 138188512 is about 11755.3609897782. The cubic root of 138188512 is about 517.0001234618. Note that the first 3 decimals are identical.

The spelling of 138188512 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, five hundred twelve".