138908850 has 48 divisors (see below), whose sum is σ = 348081888. Its totient is φ = 36656640.

The previous prime is 138908843. The next prime is 138908851. The reversal of 138908850 is 58809831.

It is not an unprimeable number, because it can be changed into a prime (138908851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9777 + ... + 19323.

It is an arithmetic number, because the mean of its divisors is an integer number (7251706).

Almost surely, 2^138908850 is an apocalyptic number.

138908850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138908850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174040944).

138908850 is an abundant number, since it is smaller than the sum of its proper divisors (209173038).

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

138908850 is a wasteful number, since it uses less digits than its factorization.

138908850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9659 (or 9654 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 138908850 is about 11785.9598675712. The cubic root of 138908850 is about 517.8968926625.

The spelling of 138908850 in words is "one hundred thirty-eight million, nine hundred eight thousand, eight hundred fifty".