138413815 has 4 divisors (see below), whose sum is σ = 166096584. Its totient is φ = 110731048.

The previous prime is 138413773. The next prime is 138413831. The reversal of 138413815 is 518314831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518314831 = 83 ⋅6244757.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138413815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13841377 + ... + 13841386.

It is an arithmetic number, because the mean of its divisors is an integer number (41524146).

Almost surely, 2^138413815 is an apocalyptic number.

138413815 is a deficient number, since it is larger than the sum of its proper divisors (27682769).

138413815 is an equidigital number, since it uses as much as digits as its factorization.

138413815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27682768.

The product of its digits is 11520, while the sum is 34.

The square root of 138413815 is about 11764.9400763455. The cubic root of 138413815 is about 517.2809437953.

The spelling of 138413815 in words is "one hundred thirty-eight million, four hundred thirteen thousand, eight hundred fifteen".