138155500 has 72 divisors (see below), whose sum is σ = 351056160. Its totient is φ = 47359200.

The previous prime is 138155497. The next prime is 138155519. The reversal of 138155500 is 5551831.

It is a Harshad number since it is a multiple of its sum of digits (28).

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 23 ways as a sum of consecutive naturals, for example, 21681 + ... + 27319.

It is an arithmetic number, because the mean of its divisors is an integer number (4875780).

Almost surely, 2^138155500 is an apocalyptic number.

138155500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138155500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175528080).

138155500 is an abundant number, since it is smaller than the sum of its proper divisors (212900660).

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

138155500 is a wasteful number, since it uses less digits than its factorization.

138155500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672 (or 5653 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 138155500 is about 11753.9567805910. The cubic root of 138155500 is about 516.9589512807.

The spelling of 138155500 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, five hundred".