138865553 has 8 divisors (see below), whose sum is σ = 140177856. Its totient is φ = 137559600.

The previous prime is 138865541. The next prime is 138865561. The reversal of 138865553 is 355568831.

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 138865553 - 2¹⁰ = 138864529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138862553) 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, 49868 + ... + 52578.

It is an arithmetic number, because the mean of its divisors is an integer number (17522232).

Almost surely, 2^138865553 is an apocalyptic number.

It is an amenable number.

138865553 is a deficient number, since it is larger than the sum of its proper divisors (1312303).

138865553 is a wasteful number, since it uses less digits than its factorization.

138865553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3175.

The product of its digits is 432000, while the sum is 44.

The square root of 138865553 is about 11784.1229202686. The cubic root of 138865553 is about 517.8430786881.

The spelling of 138865553 in words is "one hundred thirty-eight million, eight hundred sixty-five thousand, five hundred fifty-three".