138279226 has 16 divisors (see below), whose sum is σ = 222458400. Its totient is φ = 64263888.

The previous prime is 138279143. The next prime is 138279263. The reversal of 138279226 is 622972831.

It is a super-2 number, since 2×138279226² = 38242288686318152, which contains 22 as substring.

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, 32316 + ... + 36343.

It is an arithmetic number, because the mean of its divisors is an integer number (13903650).

Almost surely, 2^138279226 is an apocalyptic number.

138279226 is a deficient number, since it is larger than the sum of its proper divisors (84179174).

138279226 is a wasteful number, since it uses less digits than its factorization.

138279226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68733.

The product of its digits is 72576, while the sum is 40.

The square root of 138279226 is about 11759.2187665678. The cubic root of 138279226 is about 517.1132271488.

It can be divided in two parts, 1382 and 79226, that added together give a palindrome (80608).

The spelling of 138279226 in words is "one hundred thirty-eight million, two hundred seventy-nine thousand, two hundred twenty-six".