138908226 has 8 divisors (see below), whose sum is σ = 277816464. Its totient is φ = 46302740.

The previous prime is 138908213. The next prime is 138908227. The reversal of 138908226 is 622809831.

It is a happy number.

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

138908226 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138908227) 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, 11575680 + ... + 11575691.

It is an arithmetic number, because the mean of its divisors is an integer number (34727058).

Almost surely, 2^138908226 is an apocalyptic number.

138908226 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138908226 is a wasteful number, since it uses less digits than its factorization.

138908226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23151376.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 138908226 is about 11785.9333953659. The cubic root of 138908226 is about 517.8961171704.

The spelling of 138908226 in words is "one hundred thirty-eight million, nine hundred eight thousand, two hundred twenty-six".