138140145 has 48 divisors (see below), whose sum is σ = 281316672. Its totient is φ = 61822080.

The previous prime is 138140141. The next prime is 138140183. The reversal of 138140145 is 541041831.

It is a happy number.

It is not a de Polignac number, because 138140145 - 2² = 138140141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138140141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4299 + ... + 17168.

It is an arithmetic number, because the mean of its divisors is an integer number (5860764).

Almost surely, 2^138140145 is an apocalyptic number.

138140145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138140145 is an abundant number, since it is smaller than the sum of its proper divisors (143176527).

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

138140145 is a wasteful number, since it uses less digits than its factorization.

138140145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21502 (or 21499 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 138140145 is about 11753.3035781435. The cubic root of 138140145 is about 516.9397984691.

Adding to 138140145 its reverse (541041831), we get a palindrome (679181976).

The spelling of 138140145 in words is "one hundred thirty-eight million, one hundred forty thousand, one hundred forty-five".