138668145 has 64 divisors (see below), whose sum is σ = 278415360. Its totient is φ = 57254400.

The previous prime is 138668143. The next prime is 138668197. The reversal of 138668145 is 541866831.

It is not a de Polignac number, because 138668145 - 2¹ = 138668143 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138668097 and 138668106.

It is not an unprimeable number, because it can be changed into a prime (138668143) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 243421 + ... + 243989.

It is an arithmetic number, because the mean of its divisors is an integer number (4350240).

Almost surely, 2^138668145 is an apocalyptic number.

138668145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138668145 is an abundant number, since it is smaller than the sum of its proper divisors (139747215).

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

138668145 is a wasteful number, since it uses less digits than its factorization.

138668145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806.

The product of its digits is 138240, while the sum is 42.

The square root of 138668145 is about 11775.7439255446. The cubic root of 138668145 is about 517.5975778099.

The spelling of 138668145 in words is "one hundred thirty-eight million, six hundred sixty-eight thousand, one hundred forty-five".