138499 has 4 divisors (see below), whose sum is σ = 146664. Its totient is φ = 130336.

The previous prime is 138497. The next prime is 138511. The reversal of 138499 is 994831.

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 138499 - 2¹ = 138497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4057 + ... + 4090.

It is an arithmetic number, because the mean of its divisors is an integer number (36666).

2¹³⁸⁴⁹⁹ is an apocalyptic number.

138499 is a deficient number, since it is larger than the sum of its proper divisors (8165).

138499 is an equidigital number, since it uses as much as digits as its factorization.

138499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8164.

The product of its digits is 7776, while the sum is 34.

The square root of 138499 is about 372.1545377931. The cubic root of 138499 is about 51.7387039998.

The spelling of 138499 in words is "one hundred thirty-eight thousand, four hundred ninety-nine".