138216415 has 4 divisors (see below), whose sum is σ = 165859704. Its totient is φ = 110573128.

The previous prime is 138216391. The next prime is 138216437. The reversal of 138216415 is 514612831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 514612831 = 17 ⋅30271343.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138216415 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 13821637 + ... + 13821646.

It is an arithmetic number, because the mean of its divisors is an integer number (41464926).

Almost surely, 2^138216415 is an apocalyptic number.

138216415 is a deficient number, since it is larger than the sum of its proper divisors (27643289).

138216415 is an equidigital number, since it uses as much as digits as its factorization.

138216415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27643288.

The product of its digits is 5760, while the sum is 31.

The square root of 138216415 is about 11756.5477500838. The cubic root of 138216415 is about 517.0349186446.

The spelling of 138216415 in words is "one hundred thirty-eight million, two hundred sixteen thousand, four hundred fifteen".