138903 has 4 divisors (see below), whose sum is σ = 185208. Its totient is φ = 92600.

The previous prime is 138899. The next prime is 138917. The reversal of 138903 is 309831.

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 138903 - 2² = 138899 is a prime.

It is a D-number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138923) 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, 23148 + ... + 23153.

It is an arithmetic number, because the mean of its divisors is an integer number (46302).

2¹³⁸⁹⁰³ is an apocalyptic number.

138903 is a deficient number, since it is larger than the sum of its proper divisors (46305).

138903 is an equidigital number, since it uses as much as digits as its factorization.

138903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46304.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 138903 is about 372.6969278113. The cubic root of 138903 is about 51.7889622333.

The spelling of 138903 in words is "one hundred thirty-eight thousand, nine hundred three".