138616220 has 12 divisors (see below), whose sum is σ = 291094104. Its totient is φ = 55446480.

The previous prime is 138616199. The next prime is 138616223. The reversal of 138616220 is 22616831.

138616220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138616223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3465386 + ... + 3465425.

It is an arithmetic number, because the mean of its divisors is an integer number (24257842).

Almost surely, 2^138616220 is an apocalyptic number.

138616220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138616220 is an abundant number, since it is smaller than the sum of its proper divisors (152477884).

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

138616220 is a wasteful number, since it uses less digits than its factorization.

138616220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930820 (or 6930818 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 138616220 is about 11773.5389751765. The cubic root of 138616220 is about 517.5329640526.

The spelling of 138616220 in words is "one hundred thirty-eight million, six hundred sixteen thousand, two hundred twenty".