138855808 has 144 divisors (see below), whose sum is σ = 351107460. Its totient is φ = 54512640.

The previous prime is 138855803. The next prime is 138855809. The reversal of 138855808 is 808558831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138855803) 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, 1059903 + ... + 1060033.

Almost surely, 2^138855808 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 138855808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175553730).

138855808 is an abundant number, since it is smaller than the sum of its proper divisors (212251652).

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

138855808 is a wasteful number, since it uses less digits than its factorization.

138855808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 46.

The square root of 138855808 is about 11783.7094329417. The cubic root of 138855808 is about 517.8309650555.

The spelling of 138855808 in words is "one hundred thirty-eight million, eight hundred fifty-five thousand, eight hundred eight".