138028265 has 4 divisors (see below), whose sum is σ = 165633924. Its totient is φ = 110422608.

The previous prime is 138028259. The next prime is 138028273. The reversal of 138028265 is 562820831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94322944 + 43705321 = 9712^2 + 6611^2 .

It is a cyclic number.

It is not a de Polignac number, because 138028265 - 2⁴ = 138028249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13802822 + ... + 13802831.

It is an arithmetic number, because the mean of its divisors is an integer number (41408481).

Almost surely, 2^138028265 is an apocalyptic number.

It is an amenable number.

138028265 is a deficient number, since it is larger than the sum of its proper divisors (27605659).

138028265 is an equidigital number, since it uses as much as digits as its factorization.

138028265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27605658.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 138028265 is about 11748.5431011679. The cubic root of 138028265 is about 516.8002038922.

The spelling of 138028265 in words is "one hundred thirty-eight million, twenty-eight thousand, two hundred sixty-five".