138279219 has 16 divisors (see below), whose sum is σ = 199063200. Its totient is φ = 84877056.

The previous prime is 138279143. The next prime is 138279263. The reversal of 138279219 is 912972831.

It is not a de Polignac number, because 138279219 - 2¹³ = 138271027 is a prime.

It is a super-2 number, since 2×138279219² = 38242284814499922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138279269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11617 + ... + 20285.

It is an arithmetic number, because the mean of its divisors is an integer number (12441450).

Almost surely, 2^138279219 is an apocalyptic number.

138279219 is a deficient number, since it is larger than the sum of its proper divisors (60783981).

138279219 is a wasteful number, since it uses less digits than its factorization.

138279219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9094.

The product of its digits is 54432, while the sum is 42.

The square root of 138279219 is about 11759.2184689290. The cubic root of 138279219 is about 517.1132184230.

It can be divided in two parts, 1382 and 79219, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 138279219 in words is "one hundred thirty-eight million, two hundred seventy-nine thousand, two hundred nineteen".