138913 has 4 divisors (see below), whose sum is σ = 141588. Its totient is φ = 136240.

The previous prime is 138899. The next prime is 138917. The reversal of 138913 is 319831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 107584 + 31329 = 328^2 + 177^2 .

It is a cyclic number.

It is not a de Polignac number, because 138913 - 2⁹ = 138401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138917) 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, 1258 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (35397).

2¹³⁸⁹¹³ is an apocalyptic number.

It is an amenable number.

138913 is a deficient number, since it is larger than the sum of its proper divisors (2675).

138913 is an equidigital number, since it uses as much as digits as its factorization.

138913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674.

The product of its digits is 648, while the sum is 25.

The square root of 138913 is about 372.7103432962. The cubic root of 138913 is about 51.7902050123.

The spelling of 138913 in words is "one hundred thirty-eight thousand, nine hundred thirteen".