138775015 has 4 divisors (see below), whose sum is σ = 166530024. Its totient is φ = 111020008.

The previous prime is 138775009. The next prime is 138775057. The reversal of 138775015 is 510577831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 510577831 = 1129 ⋅452239.

It is a cyclic number.

It is not a de Polignac number, because 138775015 - 2⁵ = 138774983 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13877497 + ... + 13877506.

It is an arithmetic number, because the mean of its divisors is an integer number (41632506).

Almost surely, 2^138775015 is an apocalyptic number.

138775015 is a deficient number, since it is larger than the sum of its proper divisors (27755009).

138775015 is an equidigital number, since it uses as much as digits as its factorization.

138775015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27755008.

The product of its (nonzero) digits is 29400, while the sum is 37.

The square root of 138775015 is about 11780.2807691498. The cubic root of 138775015 is about 517.7305125678.

The spelling of 138775015 in words is "one hundred thirty-eight million, seven hundred seventy-five thousand, fifteen".