1306139823 has 64 divisors (see below), whose sum is σ = 2036643840. Its totient is φ = 837008640.

The previous prime is 1306139803. The next prime is 1306139827. The reversal of 1306139823 is 3289316031.

1306139823 is a `hidden beast` number, since 1 + 30 + 613 + 9 + 8 + 2 + 3 = 666.

It is not a de Polignac number, because 1306139823 - 2⁸ = 1306139567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306139827) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9970468 + ... + 9970598.

It is an arithmetic number, because the mean of its divisors is an integer number (31822560).

Almost surely, 2^1306139823 is an apocalyptic number.

1306139823 is a deficient number, since it is larger than the sum of its proper divisors (730504017).

1306139823 is an frugal number, since it uses more digits than its factorization.

1306139823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1306139823 is about 36140.5564843709. The cubic root of 1306139823 is about 1093.1083798067.

The spelling of 1306139823 in words is "one billion, three hundred six million, one hundred thirty-nine thousand, eight hundred twenty-three".