138109220 has 12 divisors (see below), whose sum is σ = 290029404. Its totient is φ = 55243680.

The previous prime is 138109193. The next prime is 138109243. The reversal of 138109220 is 22901831.

It can be written as a sum of positive squares in 2 ways, for example, as 71098624 + 67010596 = 8432^2 + 8186^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138109220.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3452711 + ... + 3452750.

It is an arithmetic number, because the mean of its divisors is an integer number (24169117).

Almost surely, 2^138109220 is an apocalyptic number.

138109220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138109220 is an abundant number, since it is smaller than the sum of its proper divisors (151920184).

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

138109220 is a wasteful number, since it uses less digits than its factorization.

138109220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6905470 (or 6905468 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 138109220 is about 11751.9879169441. The cubic root of 138109220 is about 516.9012203610.

The spelling of 138109220 in words is "one hundred thirty-eight million, one hundred nine thousand, two hundred twenty".