138479517 has 16 divisors (see below), whose sum is σ = 223805760. Its totient is φ = 83926800.

The previous prime is 138479503. The next prime is 138479519. The reversal of 138479517 is 715974831.

It is not a de Polignac number, because 138479517 - 2⁸ = 138479261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138479519) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 232834 + ... + 233427.

It is an arithmetic number, because the mean of its divisors is an integer number (13987860).

Almost surely, 2^138479517 is an apocalyptic number.

It is an amenable number.

138479517 is a deficient number, since it is larger than the sum of its proper divisors (85326243).

138479517 is a wasteful number, since it uses less digits than its factorization.

138479517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466281 (or 466275 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 138479517 is about 11767.7320244812. The cubic root of 138479517 is about 517.3627781518.

The spelling of 138479517 in words is "one hundred thirty-eight million, four hundred seventy-nine thousand, five hundred seventeen".