138877228 has 24 divisors (see below), whose sum is σ = 280623392. Its totient is φ = 58904064.

The previous prime is 138877223. The next prime is 138877231. The reversal of 138877228 is 822778831.

It is not an unprimeable number, because it can be changed into a prime (138877223) 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 7 ways as a sum of consecutive naturals, for example, 22851 + ... + 28282.

Almost surely, 2^138877228 is an apocalyptic number.

It is an amenable number.

138877228 is an abundant number, since it is smaller than the sum of its proper divisors (141746164).

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

138877228 is a wasteful number, since it uses less digits than its factorization.

138877228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51241 (or 51239 counting only the distinct ones).

The product of its digits is 301056, while the sum is 46.

The square root of 138877228 is about 11784.6182797747. The cubic root of 138877228 is about 517.8575906828.

It can be divided in two parts, 13887 and 7228, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 138877228 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, two hundred twenty-eight".