138600018 has 16 divisors (see below), whose sum is σ = 308000160. Its totient is φ = 46199988.

The previous prime is 138600017. The next prime is 138600043. The reversal of 138600018 is 810006831.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 138599964 and 138600000.

It is not an unprimeable number, because it can be changed into a prime (138600017) 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, 1283280 + ... + 1283387.

It is an arithmetic number, because the mean of its divisors is an integer number (19250010).

Almost surely, 2^138600018 is an apocalyptic number.

138600018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138600018 is an abundant number, since it is smaller than the sum of its proper divisors (169400142).

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

138600018 is a wasteful number, since it uses less digits than its factorization.

138600018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566678 (or 2566672 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 138600018 is about 11772.8508866799. The cubic root of 138600018 is about 517.5127995154.

Adding to 138600018 its reverse (810006831), we get a palindrome (948606849).

The spelling of 138600018 in words is "one hundred thirty-eight million, six hundred thousand, eighteen".