138818680 has 128 divisors (see below), whose sum is σ = 419489280. Its totient is φ = 39928320.

The previous prime is 138818671. The next prime is 138818689. The reversal of 138818680 is 86818831.

It is an interprime number because it is at equal distance from previous prime (138818671) and next prime (138818689).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138818689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38307 + ... + 41773.

It is an arithmetic number, because the mean of its divisors is an integer number (3277260).

Almost surely, 2^138818680 is an apocalyptic number.

138818680 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 138818680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209744640).

138818680 is an abundant number, since it is smaller than the sum of its proper divisors (280670600).

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

138818680 is a wasteful number, since it uses less digits than its factorization.

138818680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509 (or 3505 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 43.

The square root of 138818680 is about 11782.1339323571. The cubic root of 138818680 is about 517.7848074810.

It can be divided in two parts, 138 and 818680, that added together give a palindrome (818818).

The spelling of 138818680 in words is "one hundred thirty-eight million, eight hundred eighteen thousand, six hundred eighty".