138392565 has 8 divisors (see below), whose sum is σ = 221428128. Its totient is φ = 73809360.

The previous prime is 138392539. The next prime is 138392609. The reversal of 138392565 is 565293831.

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

It is not a de Polignac number, because 138392565 - 2²³ = 130003957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4613071 + ... + 4613100.

It is an arithmetic number, because the mean of its divisors is an integer number (27678516).

Almost surely, 2^138392565 is an apocalyptic number.

138392565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138392565 is a deficient number, since it is larger than the sum of its proper divisors (83035563).

138392565 is an equidigital number, since it uses as much as digits as its factorization.

138392565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9226179.

The product of its digits is 194400, while the sum is 42.

The square root of 138392565 is about 11764.0369346581. The cubic root of 138392565 is about 517.2544705644.

The spelling of 138392565 in words is "one hundred thirty-eight million, three hundred ninety-two thousand, five hundred sixty-five".