138673518 has 16 divisors (see below), whose sum is σ = 281487360. Its totient is φ = 45534456.

The previous prime is 138673517. The next prime is 138673523. The reversal of 138673518 is 815376831.

It is a self number, because there is not a number n which added to its sum of digits gives 138673518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138673511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172078 + ... + 172881.

It is an arithmetic number, because the mean of its divisors is an integer number (17592960).

Almost surely, 2^138673518 is an apocalyptic number.

138673518 is an abundant number, since it is smaller than the sum of its proper divisors (142813842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138673518 is a wasteful number, since it uses less digits than its factorization.

138673518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345031.

The product of its digits is 120960, while the sum is 42.

The square root of 138673518 is about 11775.9720617875. The cubic root of 138673518 is about 517.6042628729.

The spelling of 138673518 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, five hundred eighteen".