138149888 has 76 divisors (see below), whose sum is σ = 301989312. Its totient is φ = 62914560.

The previous prime is 138149831. The next prime is 138149909. The reversal of 138149888 is 888941831.

138149888 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4456433 + ... + 4456463.

Almost surely, 2^138149888 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 138149888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150994656).

138149888 is an abundant number, since it is smaller than the sum of its proper divisors (163839424).

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

138149888 is an frugal number, since it uses more digits than its factorization.

138149888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 50 counting only the distinct ones).

The product of its digits is 442368, while the sum is 50.

The square root of 138149888 is about 11753.7180500470. The cubic root of 138149888 is about 516.9519514076.

The spelling of 138149888 in words is "one hundred thirty-eight million, one hundred forty-nine thousand, eight hundred eighty-eight".