138216144 has 40 divisors (see below), whose sum is σ = 389519712. Its totient is φ = 41883520.

The previous prime is 138216139. The next prime is 138216157. The reversal of 138216144 is 441612831.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 130359 + ... + 131414.

Almost surely, 2^138216144 is an apocalyptic number.

It is an amenable number.

138216144 is an abundant number, since it is smaller than the sum of its proper divisors (251303568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138216144 is a wasteful number, since it uses less digits than its factorization.

138216144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261795 (or 261789 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 138216144 is about 11756.5362245859. The cubic root of 138216144 is about 517.0345807288.

Adding to 138216144 its reverse (441612831), we get a palindrome (579828975).

The spelling of 138216144 in words is "one hundred thirty-eight million, two hundred sixteen thousand, one hundred forty-four".