138188569 has 8 divisors (see below), whose sum is σ = 138996000. Its totient is φ = 137384256.

The previous prime is 138188551. The next prime is 138188593. The reversal of 138188569 is 965881831.

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 138188569 - 2⁷ = 138188441 is a prime.

It is a super-2 number, since 2×138188569² = 38192161204535522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138188069) by changing a digit.

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, 232737 + ... + 233329.

It is an arithmetic number, because the mean of its divisors is an integer number (17374500).

Almost surely, 2^138188569 is an apocalyptic number.

It is an amenable number.

138188569 is a deficient number, since it is larger than the sum of its proper divisors (807431).

138188569 is an equidigital number, since it uses as much as digits as its factorization.

138188569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559.

The product of its digits is 414720, while the sum is 49.

The square root of 138188569 is about 11755.3634142037. The cubic root of 138188569 is about 517.0001945459. Note that the first 3 decimals are identical.

The spelling of 138188569 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, five hundred sixty-nine".