38138387765 has 4 divisors (see below), whose sum is σ = 45766065324. Its totient is φ = 30510710208.

The previous prime is 38138387759. The next prime is 38138387789. The reversal of 38138387765 is 56778383183.

It is a happy number.

38138387765 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 24608510641 + 13529877124 = 156871^2 + 116318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38138387765 is a prime.

It is a Duffinian number.

It is a congruent 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, 3813838772 + ... + 3813838781.

It is an arithmetic number, because the mean of its divisors is an integer number (11441516331).

Almost surely, 2^38138387765 is an apocalyptic number.

It is an amenable number.

38138387765 is a deficient number, since it is larger than the sum of its proper divisors (7627677559).

38138387765 is an equidigital number, since it uses as much as digits as its factorization.

38138387765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7627677558.

The product of its digits is 20321280, while the sum is 59.

The spelling of 38138387765 in words is "thirty-eight billion, one hundred thirty-eight million, three hundred eighty-seven thousand, seven hundred sixty-five".