138068940 has 48 divisors (see below), whose sum is σ = 389081952. Its totient is φ = 36581376.

The previous prime is 138068933. The next prime is 138068969. The reversal of 138068940 is 49860831.

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 15 ways as a sum of consecutive naturals, for example, 2092 + ... + 16748.

It is an arithmetic number, because the mean of its divisors is an integer number (8105874).

Almost surely, 2^138068940 is an apocalyptic number.

138068940 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 138068940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194540976).

138068940 is an abundant number, since it is smaller than the sum of its proper divisors (251013012).

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

138068940 is a wasteful number, since it uses less digits than its factorization.

138068940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14826 (or 14824 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 138068940 is about 11750.2740393576. The cubic root of 138068940 is about 516.8509635048.

The spelling of 138068940 in words is "one hundred thirty-eight million, sixty-eight thousand, nine hundred forty".