138220844276 has 12 divisors (see below), whose sum is σ = 242425203300. Its totient is φ = 68956500480.

The previous prime is 138220844273. The next prime is 138220844287. The reversal of 138220844276 is 672448022831.

It can be written as a sum of positive squares in 2 ways, for example, as 94418540176 + 43802304100 = 307276^2 + 209290^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138220844276.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138220844273) 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, 38478395 + ... + 38481986.

It is an arithmetic number, because the mean of its divisors is an integer number (20202100275).

Almost surely, 2^138220844276 is an apocalyptic number.

It is an amenable number.

138220844276 is a deficient number, since it is larger than the sum of its proper divisors (104204359024).

138220844276 is a wasteful number, since it uses less digits than its factorization.

138220844276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76960834 (or 76960832 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 47.

The spelling of 138220844276 in words is "one hundred thirty-eight billion, two hundred twenty million, eight hundred forty-four thousand, two hundred seventy-six".