138213115 has 4 divisors (see below), whose sum is σ = 165855744. Its totient is φ = 110570488.

The previous prime is 138213059. The next prime is 138213133. The reversal of 138213115 is 511312831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138213115 - 2⁹ = 138212603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138213115.

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, 13821307 + ... + 13821316.

It is an arithmetic number, because the mean of its divisors is an integer number (41463936).

Almost surely, 2^138213115 is an apocalyptic number.

138213115 is a deficient number, since it is larger than the sum of its proper divisors (27642629).

138213115 is an equidigital number, since it uses as much as digits as its factorization.

138213115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27642628.

The product of its digits is 720, while the sum is 25.

The square root of 138213115 is about 11756.4074019234. The cubic root of 138213115 is about 517.0308037720.

Adding to 138213115 its reverse (511312831), we get a palindrome (649525946).

It can be divided in two parts, 13 and 8213115, that added together give a palindrome (8213128).

The spelling of 138213115 in words is "one hundred thirty-eight million, two hundred thirteen thousand, one hundred fifteen".