138665369 has 8 divisors (see below), whose sum is σ = 142140288. Its totient is φ = 135212400.

The previous prime is 138665339. The next prime is 138665377. The reversal of 138665369 is 963566831.

138665369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138665369 - 2¹⁶ = 138599833 is a prime.

It is a super-2 number, since 2×138665369² = 38456169119812322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138665309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7694 + ... + 18344.

It is an arithmetic number, because the mean of its divisors is an integer number (17767536).

Almost surely, 2^138665369 is an apocalyptic number.

It is an amenable number.

138665369 is a deficient number, since it is larger than the sum of its proper divisors (3474919).

138665369 is a wasteful number, since it uses less digits than its factorization.

138665369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10975.

The product of its digits is 699840, while the sum is 47.

The square root of 138665369 is about 11775.6260555437. The cubic root of 138665369 is about 517.5941238552.

The spelling of 138665369 in words is "one hundred thirty-eight million, six hundred sixty-five thousand, three hundred sixty-nine".