138742107 has 16 divisors (see below), whose sum is σ = 213599232. Its totient is φ = 78462720.

The previous prime is 138741997. The next prime is 138742127. The reversal of 138742107 is 701247831.

It is a happy number.

It is not a de Polignac number, because 138742107 - 2¹² = 138738011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138742127) 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, 32019 + ... + 36092.

It is an arithmetic number, because the mean of its divisors is an integer number (13349952).

Almost surely, 2^138742107 is an apocalyptic number.

138742107 is a deficient number, since it is larger than the sum of its proper divisors (74857125).

138742107 is an equidigital number, since it uses as much as digits as its factorization.

138742107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68218.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 138742107 is about 11778.8839454339. The cubic root of 138742107 is about 517.6895858380.

Adding to 138742107 its reverse (701247831), we get a palindrome (839989938).

The spelling of 138742107 in words is "one hundred thirty-eight million, seven hundred forty-two thousand, one hundred seven".