139605 has 16 divisors (see below), whose sum is σ = 229824. Its totient is φ = 72320.

The previous prime is 139597. The next prime is 139609. The reversal of 139605 is 506931.

It is not a de Polignac number, because 139605 - 2³ = 139597 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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 139605.

It is not an unprimeable number, because it can be changed into a prime (139609) 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 15 ways as a sum of consecutive naturals, for example, 502 + ... + 728.

It is an arithmetic number, because the mean of its divisors is an integer number (14364).

2¹³⁹⁶⁰⁵ is an apocalyptic number.

139605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139605 is a deficient number, since it is larger than the sum of its proper divisors (90219).

139605 is a wasteful number, since it uses less digits than its factorization.

139605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 139605 is about 373.6375248821. The cubic root of 139605 is about 51.8760608483.

The spelling of 139605 in words is "one hundred thirty-nine thousand, six hundred five".