139811305 has 4 divisors (see below), whose sum is σ = 167773572. Its totient is φ = 111849040.

The previous prime is 139811299. The next prime is 139811311. The reversal of 139811305 is 503118931.

139811305 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, and also an emirpimes, since its reverse is a distinct semiprime: 503118931 = 7 ⋅71874133.

It is an interprime number because it is at equal distance from previous prime (139811299) and next prime (139811311).

It can be written as a sum of positive squares in 2 ways, for example, as 22240656 + 117570649 = 4716^2 + 10843^2 .

It is not a de Polignac number, because 139811305 - 2²¹ = 137714153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13981126 + ... + 13981135.

It is an arithmetic number, because the mean of its divisors is an integer number (41943393).

Almost surely, 2^139811305 is an apocalyptic number.

It is an amenable number.

139811305 is a deficient number, since it is larger than the sum of its proper divisors (27962267).

139811305 is an equidigital number, since it uses as much as digits as its factorization.

139811305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27962266.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 139811305 is about 11824.1830584612. The cubic root of 139811305 is about 519.0160201370.

The spelling of 139811305 in words is "one hundred thirty-nine million, eight hundred eleven thousand, three hundred five".