138886226 has 16 divisors (see below), whose sum is σ = 221172120. Its totient is φ = 65184000.

The previous prime is 138886207. The next prime is 138886261. The reversal of 138886226 is 622688831.

It is a Cunningham number, because it is equal to 11785²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 108139201 + 30747025 = 10399^2 + 5545^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7976 + ... + 18476.

Almost surely, 2^138886226 is an apocalyptic number.

138886226 is a deficient number, since it is larger than the sum of its proper divisors (82285894).

138886226 is a wasteful number, since it uses less digits than its factorization.

138886226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10909.

The product of its digits is 221184, while the sum is 44.

The square root of 138886226 is about 11785.0000424268. Note that the first 4 decimals coincide. The cubic root of 138886226 is about 517.8687746185.

The spelling of 138886226 in words is "one hundred thirty-eight million, eight hundred eighty-six thousand, two hundred twenty-six".