1306912139 has 4 divisors (see below), whose sum is σ = 1407443856. Its totient is φ = 1206380424.

The previous prime is 1306912133. The next prime is 1306912147. The reversal of 1306912139 is 9312196031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1306912139 - 2²⁰ = 1305863563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1306912099 and 1306912108.

It is not an unprimeable number, because it can be changed into a prime (1306912133) 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, 50265839 + ... + 50265864.

It is an arithmetic number, because the mean of its divisors is an integer number (351860964).

Almost surely, 2^1306912139 is an apocalyptic number.

1306912139 is a deficient number, since it is larger than the sum of its proper divisors (100531717).

1306912139 is a wasteful number, since it uses less digits than its factorization.

1306912139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100531716.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1306912139 is about 36151.2397989336. The cubic root of 1306912139 is about 1093.3237877682.

The spelling of 1306912139 in words is "one billion, three hundred six million, nine hundred twelve thousand, one hundred thirty-nine".