138903900 has 144 divisors (see below), whose sum is σ = 430472448. Its totient is φ = 34496000.

The previous prime is 138903899. The next prime is 138903917. The reversal of 138903900 is 9309831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 282655 + ... + 283145.

It is an arithmetic number, because the mean of its divisors is an integer number (2989392).

Almost surely, 2^138903900 is an apocalyptic number.

138903900 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 138903900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215236224).

138903900 is an abundant number, since it is smaller than the sum of its proper divisors (291568548).

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

138903900 is a wasteful number, since it uses less digits than its factorization.

138903900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 138903900 is about 11785.7498700762. The cubic root of 138903900 is about 517.8907408585.

The spelling of 138903900 in words is "one hundred thirty-eight million, nine hundred three thousand, nine hundred".