138717423 has 24 divisors (see below), whose sum is σ = 227143280. Its totient is φ = 80870400.

The previous prime is 138717421. The next prime is 138717427. The reversal of 138717423 is 324717831.

It is not a de Polignac number, because 138717423 - 2¹ = 138717421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138717421) 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 23 ways as a sum of consecutive naturals, for example, 28978 + ... + 33423.

Almost surely, 2^138717423 is an apocalyptic number.

138717423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

138717423 is a deficient number, since it is larger than the sum of its proper divisors (88425857).

138717423 is a wasteful number, since it uses less digits than its factorization.

138717423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62439 (or 62436 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 138717423 is about 11777.8360915747. The cubic root of 138717423 is about 517.6588828118.

The spelling of 138717423 in words is "one hundred thirty-eight million, seven hundred seventeen thousand, four hundred twenty-three".