138822660 has 120 divisors (see below), whose sum is σ = 442337280. Its totient is φ = 36438336.

The previous prime is 138822659. The next prime is 138822667. The reversal of 138822660 is 66228831.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (138822667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 107901 + ... + 109179.

It is an arithmetic number, because the mean of its divisors is an integer number (3686144).

Almost surely, 2^138822660 is an apocalyptic number.

138822660 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 138822660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221168640).

138822660 is an abundant number, since it is smaller than the sum of its proper divisors (303514620).

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

138822660 is a wasteful number, since it uses less digits than its factorization.

138822660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 138822660 is about 11782.3028309410. The cubic root of 138822660 is about 517.7897558156.

The spelling of 138822660 in words is "one hundred thirty-eight million, eight hundred twenty-two thousand, six hundred sixty".