138918213242 has 8 divisors (see below), whose sum is σ = 209169629856. Its totient is φ = 69195003292.

The previous prime is 138918213229. The next prime is 138918213253. The reversal of 138918213242 is 242312819831.

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 = 138918213193 and 138918213202.

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, 132051008 + ... + 132052059.

It is an arithmetic number, because the mean of its divisors is an integer number (26146203732).

Almost surely, 2^138918213242 is an apocalyptic number.

138918213242 is a deficient number, since it is larger than the sum of its proper divisors (70251416614).

138918213242 is a wasteful number, since it uses less digits than its factorization.

138918213242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264103332.

The product of its digits is 165888, while the sum is 44.

The spelling of 138918213242 in words is "one hundred thirty-eight billion, nine hundred eighteen million, two hundred thirteen thousand, two hundred forty-two".