138442227 has 32 divisors (see below), whose sum is σ = 242257920. Its totient is φ = 68130720.

The previous prime is 138442217. The next prime is 138442231. The reversal of 138442227 is 722244831.

It is a happy number.

It is not a de Polignac number, because 138442227 - 2⁶ = 138442163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (138442217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11383 + ... + 20160.

It is an arithmetic number, because the mean of its divisors is an integer number (7570560).

Almost surely, 2^138442227 is an apocalyptic number.

138442227 is a deficient number, since it is larger than the sum of its proper divisors (103815693).

138442227 is a wasteful number, since it uses less digits than its factorization.

138442227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31583.

The product of its digits is 21504, while the sum is 33.

The square root of 138442227 is about 11766.1475003503. The cubic root of 138442227 is about 517.3163352064.

The spelling of 138442227 in words is "one hundred thirty-eight million, four hundred forty-two thousand, two hundred twenty-seven".