138388045 has 4 divisors (see below), whose sum is σ = 166065660. Its totient is φ = 110710432.

The previous prime is 138388043. The next prime is 138388067. The reversal of 138388045 is 540883831.

138388045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 26409321 + 111978724 = 5139^2 + 10582^2 .

It is a cyclic number.

It is not a de Polignac number, because 138388045 - 2¹ = 138388043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138387989 and 138388007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138388043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13838800 + ... + 13838809.

It is an arithmetic number, because the mean of its divisors is an integer number (41516415).

Almost surely, 2^138388045 is an apocalyptic number.

It is an amenable number.

138388045 is a deficient number, since it is larger than the sum of its proper divisors (27677615).

138388045 is an equidigital number, since it uses as much as digits as its factorization.

138388045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27677614.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 138388045 is about 11763.8448221659. The cubic root of 138388045 is about 517.2488392030.

The spelling of 138388045 in words is "one hundred thirty-eight million, three hundred eighty-eight thousand, forty-five".