138061220 has 48 divisors (see below), whose sum is σ = 332942400. Its totient is φ = 47560320.

The previous prime is 138061219. The next prime is 138061223. The reversal of 138061220 is 22160831.

It is not an unprimeable number, because it can be changed into a prime (138061223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12335 + ... + 20694.

It is an arithmetic number, because the mean of its divisors is an integer number (6936300).

Almost surely, 2^138061220 is an apocalyptic number.

138061220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138061220 is an abundant number, since it is smaller than the sum of its proper divisors (194881180).

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

138061220 is a wasteful number, since it uses less digits than its factorization.

138061220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33068 (or 33066 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 138061220 is about 11749.9455317886. The cubic root of 138061220 is about 516.8413302404.

The spelling of 138061220 in words is "one hundred thirty-eight million, sixty-one thousand, two hundred twenty".