138172226 has 8 divisors (see below), whose sum is σ = 219450060. Its totient is φ = 65022208.

The previous prime is 138172217. The next prime is 138172231. The reversal of 138172226 is 622271831.

It can be written as a sum of positive squares in 2 ways, for example, as 138039001 + 133225 = 11749^2 + 365^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 138172192 and 138172201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2031911 + ... + 2031978.

Almost surely, 2^138172226 is an apocalyptic number.

138172226 is a deficient number, since it is larger than the sum of its proper divisors (81277834).

138172226 is a wasteful number, since it uses less digits than its factorization.

138172226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4063908.

The product of its digits is 8064, while the sum is 32.

The square root of 138172226 is about 11754.6682641408. The cubic root of 138172226 is about 516.9798125723.

The spelling of 138172226 in words is "one hundred thirty-eight million, one hundred seventy-two thousand, two hundred twenty-six".