138475765 has 8 divisors (see below), whose sum is σ = 166241880. Its totient is φ = 110733312.

The previous prime is 138475759. The next prime is 138475849. The reversal of 138475765 is 567574831.

It can be written as a sum of positive squares in 4 ways, for example, as 22676644 + 115799121 = 4762^2 + 10761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138475765 - 2⁷ = 138475637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11781 + ... + 20389.

It is an arithmetic number, because the mean of its divisors is an integer number (20780235).

Almost surely, 2^138475765 is an apocalyptic number.

It is an amenable number.

138475765 is a deficient number, since it is larger than the sum of its proper divisors (27766115).

138475765 is an equidigital number, since it uses as much as digits as its factorization.

138475765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11831.

The product of its digits is 705600, while the sum is 46.

The square root of 138475765 is about 11767.5726044074. The cubic root of 138475765 is about 517.3581055891.

The spelling of 138475765 in words is "one hundred thirty-eight million, four hundred seventy-five thousand, seven hundred sixty-five".