138650220 has 144 divisors (see below), whose sum is σ = 449729280. Its totient is φ = 34473600.

The previous prime is 138650219. The next prime is 138650227. The reversal of 138650220 is 22056831.

138650220 is a `hidden beast` number, since 1 + 3 + 8 + 650 + 2 + 2 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (138650227) 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 47 ways as a sum of consecutive naturals, for example, 242535 + ... + 243105.

It is an arithmetic number, because the mean of its divisors is an integer number (3123120).

Almost surely, 2^138650220 is an apocalyptic number.

138650220 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 138650220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224864640).

138650220 is an abundant number, since it is smaller than the sum of its proper divisors (311079060).

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

138650220 is a wasteful number, since it uses less digits than its factorization.

138650220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 138650220 is about 11774.9828025352. The cubic root of 138650220 is about 517.5752743544.

The spelling of 138650220 in words is "one hundred thirty-eight million, six hundred fifty thousand, two hundred twenty".