139015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-139015 is a prime.
It is a Duffinian number.
It is a congruent number.
It is an unprimeable number.
2139015 is an apocalyptic number.
139015 is an equidigital number, since it uses as much as digits as its factorization.
139015 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 27808.
The square root of 139015 is about 372.8471536702. The cubic root of 139015 is about 51.8028779526.
Adding to 139015 its reverse (510931), we get a palindrome (649946).
The spelling of 139015 in words is "one hundred thirty-nine thousand, fifteen".