138446220 has 48 divisors (see below), whose sum is σ = 422892288. Its totient is φ = 33562560.

The previous prime is 138446219. The next prime is 138446221. The reversal of 138446220 is 22644831.

It is an interprime number because it is at equal distance from previous prime (138446219) and next prime (138446221).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (138446221) 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, 104224 + ... + 105543.

It is an arithmetic number, because the mean of its divisors is an integer number (8810256).

Almost surely, 2^138446220 is an apocalyptic number.

138446220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138446220 is an abundant number, since it is smaller than the sum of its proper divisors (284446068).

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

138446220 is a wasteful number, since it uses less digits than its factorization.

138446220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209790 (or 209788 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 138446220 is about 11766.3171808345. The cubic root of 138446220 is about 517.3213086992.

The spelling of 138446220 in words is "one hundred thirty-eight million, four hundred forty-six thousand, two hundred twenty".