138109980 has 96 divisors (see below), whose sum is σ = 399168000. Its totient is φ = 35659008.

The previous prime is 138109969. The next prime is 138109987. The reversal of 138109980 is 89901831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138109987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 513286 + ... + 513554.

It is an arithmetic number, because the mean of its divisors is an integer number (4158000).

Almost surely, 2^138109980 is an apocalyptic number.

138109980 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 138109980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199584000).

138109980 is an abundant number, since it is smaller than the sum of its proper divisors (261058020).

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

138109980 is a wasteful number, since it uses less digits than its factorization.

138109980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 138109980 is about 11752.0202518546. The cubic root of 138109980 is about 516.9021685096.

The spelling of 138109980 in words is "one hundred thirty-eight million, one hundred nine thousand, nine hundred eighty".