138743 has 4 divisors (see below), whose sum is σ = 151368. Its totient is φ = 126120.

The previous prime is 138739. The next prime is 138763. The reversal of 138743 is 347831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138743 - 2² = 138739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6296 + ... + 6317.

It is an arithmetic number, because the mean of its divisors is an integer number (37842).

2¹³⁸⁷⁴³ is an apocalyptic number.

138743 is a deficient number, since it is larger than the sum of its proper divisors (12625).

138743 is a wasteful number, since it uses less digits than its factorization.

138743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12624.

The product of its digits is 2016, while the sum is 26.

The square root of 138743 is about 372.4822143405. The cubic root of 138743 is about 51.7690696522.

The spelling of 138743 in words is "one hundred thirty-eight thousand, seven hundred forty-three".