138982787820 has 192 divisors, whose sum is σ = 438504407040. Its totient is φ = 36541725696.

The previous prime is 138982787807. The next prime is 138982787857. The reversal of 138982787820 is 28787289831.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11172324 + ... + 11184756.

It is an arithmetic number, because the mean of its divisors is an integer number (2283877120).

Almost surely, 2^138982787820 is an apocalyptic number.

138982787820 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 138982787820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219252203520).

138982787820 is an abundant number, since it is smaller than the sum of its proper divisors (299521619220).

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

138982787820 is a wasteful number, since it uses less digits than its factorization.

138982787820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12741 (or 12733 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 63.

The spelling of 138982787820 in words is "one hundred thirty-eight billion, nine hundred eighty-two million, seven hundred eighty-seven thousand, eight hundred twenty".