138869894820 has 24 divisors (see below), whose sum is σ = 388835705664. Its totient is φ = 37031971936.

The previous prime is 138869894819. The next prime is 138869894851. The reversal of 138869894820 is 28498968831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1157249064 + ... + 1157249183.

It is an arithmetic number, because the mean of its divisors is an integer number (16201487736).

Almost surely, 2^138869894820 is an apocalyptic number.

138869894820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138869894820 is an abundant number, since it is smaller than the sum of its proper divisors (249965810844).

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

138869894820 is a wasteful number, since it uses less digits than its factorization.

138869894820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314498259 (or 2314498257 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 66.

The spelling of 138869894820 in words is "one hundred thirty-eight billion, eight hundred sixty-nine million, eight hundred ninety-four thousand, eight hundred twenty".