138895423 has 10 divisors (see below), whose sum is σ = 147665024. Its totient is φ = 130646496.

The previous prime is 138895417. The next prime is 138895429. The reversal of 138895423 is 324598831.

It is an interprime number because it is at equal distance from previous prime (138895417) and next prime (138895429).

It is a de Polignac number, because none of the positive numbers 2^k-138895423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138895423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138895429) 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 9 ways as a sum of consecutive naturals, for example, 82690 + ... + 84352.

Almost surely, 2^138895423 is an apocalyptic number.

138895423 is a deficient number, since it is larger than the sum of its proper divisors (8769601).

138895423 is an frugal number, since it uses more digits than its factorization.

138895423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731 (or 1680 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 138895423 is about 11785.3902353719. The cubic root of 138895423 is about 517.8802053993.

The spelling of 138895423 in words is "one hundred thirty-eight million, eight hundred ninety-five thousand, four hundred twenty-three".