138518 has 4 divisors (see below), whose sum is σ = 207780. Its totient is φ = 69258.

The previous prime is 138517. The next prime is 138547. The reversal of 138518 is 815831.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×138518³ = 7973332803383496, which contains 333 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138518.

It is not an unprimeable number, because it can be changed into a prime (138511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34628 + ... + 34631.

It is an arithmetic number, because the mean of its divisors is an integer number (51945).

2¹³⁸⁵¹⁸ is an apocalyptic number.

138518 is a deficient number, since it is larger than the sum of its proper divisors (69262).

138518 is an equidigital number, since it uses as much as digits as its factorization.

138518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69261.

The product of its digits is 960, while the sum is 26.

The square root of 138518 is about 372.1800639475. The cubic root of 138518 is about 51.7410698182.

It can be divided in two parts, 138 and 518, that added together give a palindrome (656).

The spelling of 138518 in words is "one hundred thirty-eight thousand, five hundred eighteen".