138723 has 8 divisors (see below), whose sum is σ = 199248. Its totient is φ = 85344.

The previous prime is 138683. The next prime is 138727. The reversal of 138723 is 327831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138723 - 2¹⁰ = 137699 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138693 and 138702.

It is not an unprimeable number, because it can be changed into a prime (138727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1740 + ... + 1817.

It is an arithmetic number, because the mean of its divisors is an integer number (24906).

2¹³⁸⁷²³ is an apocalyptic number.

138723 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

138723 is a deficient number, since it is larger than the sum of its proper divisors (60525).

138723 is a wasteful number, since it uses less digits than its factorization.

138723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573.

The product of its digits is 1008, while the sum is 24.

The square root of 138723 is about 372.4553664535. The cubic root of 138723 is about 51.7665820044.

It can be divided in two parts, 13872 and 3, that multiplied together give a triangular number (41616 = T₂₈₈).

The spelling of 138723 in words is "one hundred thirty-eight thousand, seven hundred twenty-three".