138511869 has 16 divisors (see below), whose sum is σ = 195914880. Its totient is φ = 86745600.

The previous prime is 138511861. The next prime is 138511873. The reversal of 138511869 is 968115831.

It is not a de Polignac number, because 138511869 - 2³ = 138511861 is a prime.

It is a super-2 number, since 2×138511869² = 38371075707746322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138511869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138511861) 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 15 ways as a sum of consecutive naturals, for example, 28392 + ... + 32910.

It is an arithmetic number, because the mean of its divisors is an integer number (12244680).

Almost surely, 2^138511869 is an apocalyptic number.

It is an amenable number.

138511869 is a deficient number, since it is larger than the sum of its proper divisors (57403011).

138511869 is a wasteful number, since it uses less digits than its factorization.

138511869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140.

The product of its digits is 51840, while the sum is 42.

The square root of 138511869 is about 11769.1065506265. The cubic root of 138511869 is about 517.4030642959.

The spelling of 138511869 in words is "one hundred thirty-eight million, five hundred eleven thousand, eight hundred sixty-nine".