139705 has 4 divisors (see below), whose sum is σ = 167652. Its totient is φ = 111760.

The previous prime is 139703. The next prime is 139709. The reversal of 139705 is 507931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507931 = 59 ⋅8609.

It can be written as a sum of positive squares in 2 ways, for example, as 59049 + 80656 = 243^2 + 284^2 .

It is not a de Polignac number, because 139705 - 2¹ = 139703 is a prime.

It is a d-powerful number, because it can be written as 1 + 3⁷ + 7³ + 9⁵ + 0 + 5⁷ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139705.

It is not an unprimeable number, because it can be changed into a prime (139703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13966 + ... + 13975.

It is an arithmetic number, because the mean of its divisors is an integer number (41913).

2¹³⁹⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

139705 is a deficient number, since it is larger than the sum of its proper divisors (27947).

139705 is an equidigital number, since it uses as much as digits as its factorization.

139705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27946.

The product of its (nonzero) digits is 945, while the sum is 25.

The square root of 139705 is about 373.7713204621. The cubic root of 139705 is about 51.8884442824. Note that the first 3 decimals are identical.

The spelling of 139705 in words is "one hundred thirty-nine thousand, seven hundred five".