139205 has 8 divisors (see below), whose sum is σ = 182304. Its totient is φ = 101200.

The previous prime is 139201. The next prime is 139241. The reversal of 139205 is 502931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139205 - 2² = 139201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139205.

It is not an unprimeable number, because it can be changed into a prime (139201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1211 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (22788).

2¹³⁹²⁰⁵ is an apocalyptic number.

It is an amenable number.

139205 is a deficient number, since it is larger than the sum of its proper divisors (43099).

139205 is a wasteful number, since it uses less digits than its factorization.

139205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 139205 is about 373.1018627667. The cubic root of 139205 is about 51.8264678916.

The spelling of 139205 in words is "one hundred thirty-nine thousand, two hundred five".