138342138 has 32 divisors (see below), whose sum is σ = 306961920. Its totient is φ = 41210160.

The previous prime is 138342133. The next prime is 138342161. The reversal of 138342138 is 831243831.

It is a super-2 number, since 2×138342138² = 38277094292822088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 138342099 and 138342108.

It is not an unprimeable number, because it can be changed into a prime (138342133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13870 + ... + 21657.

It is an arithmetic number, because the mean of its divisors is an integer number (9592560).

Almost surely, 2^138342138 is an apocalyptic number.

138342138 is an abundant number, since it is smaller than the sum of its proper divisors (168619782).

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

138342138 is a wasteful number, since it uses less digits than its factorization.

138342138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35602.

The product of its digits is 13824, while the sum is 33.

The square root of 138342138 is about 11761.8934700158. The cubic root of 138342138 is about 517.1916378058.

Adding to 138342138 its reverse (831243831), we get a palindrome (969585969).

The spelling of 138342138 in words is "one hundred thirty-eight million, three hundred forty-two thousand, one hundred thirty-eight".