139865 has 8 divisors (see below), whose sum is σ = 183168. Its totient is φ = 101680.

The previous prime is 139861. The next prime is 139871. The reversal of 139865 is 568931.

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

It is not a de Polignac number, because 139865 - 2² = 139861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139865.

It is not an unprimeable number, because it can be changed into a prime (139861) 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 7 ways as a sum of consecutive naturals, for example, 1217 + ... + 1326.

It is an arithmetic number, because the mean of its divisors is an integer number (22896).

2¹³⁹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

139865 is a deficient number, since it is larger than the sum of its proper divisors (43303).

139865 is a wasteful number, since it uses less digits than its factorization.

139865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559.

The product of its digits is 6480, while the sum is 32.

The square root of 139865 is about 373.9852938285. The cubic root of 139865 is about 51.9082454913.

The spelling of 139865 in words is "one hundred thirty-nine thousand, eight hundred sixty-five".