138516845 has 4 divisors (see below), whose sum is σ = 166220220. Its totient is φ = 110813472.

The previous prime is 138516827. The next prime is 138516853. The reversal of 138516845 is 548615831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548615831 = 409 ⋅1341359.

It can be written as a sum of positive squares in 2 ways, for example, as 20620681 + 117896164 = 4541^2 + 10858^2 .

It is a cyclic number.

It is not a de Polignac number, because 138516845 - 2⁸ = 138516589 is a prime.

It is a super-3 number, since 3×138516845³ (a number of 25 digits) contains 333 as substring.

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, 13851680 + ... + 13851689.

It is an arithmetic number, because the mean of its divisors is an integer number (41555055).

Almost surely, 2^138516845 is an apocalyptic number.

It is an amenable number.

138516845 is a deficient number, since it is larger than the sum of its proper divisors (27703375).

138516845 is an equidigital number, since it uses as much as digits as its factorization.

138516845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27703374.

The product of its digits is 115200, while the sum is 41.

The square root of 138516845 is about 11769.3179496520. The cubic root of 138516845 is about 517.4092600750.

The spelling of 138516845 in words is "one hundred thirty-eight million, five hundred sixteen thousand, eight hundred forty-five".