138237478500 has 576 divisors, whose sum is σ = 464011591680. Its totient is φ = 31917600000.

The previous prime is 138237478499. The next prime is 138237478501. The reversal of 138237478500 is 5874732831.

It is an interprime number because it is at equal distance from previous prime (138237478499) and next prime (138237478501).

It is a self number, because there is not a number n which added to its sum of digits gives 138237478500.

It is not an unprimeable number, because it can be changed into a prime (138237478501) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 444493345 + ... + 444493655.

It is an arithmetic number, because the mean of its divisors is an integer number (805575680).

Almost surely, 2^138237478500 is an apocalyptic number.

138237478500 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 138237478500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232005795840).

138237478500 is an abundant number, since it is smaller than the sum of its proper divisors (325774113180).

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

138237478500 is a wasteful number, since it uses less digits than its factorization.

138237478500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 138237478500 in words is "one hundred thirty-eight billion, two hundred thirty-seven million, four hundred seventy-eight thousand, five hundred".