1305139293 has 6 divisors (see below), whose sum is σ = 1885201214. Its totient is φ = 870092856.

The previous prime is 1305139247. The next prime is 1305139307. The reversal of 1305139293 is 3929315031.

1305139293 is a `hidden beast` number, since 130 + 51 + 392 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 678237849 + 626901444 = 26043^2 + 25038^2 .

It is not a de Polignac number, because 1305139293 - 2¹⁰ = 1305138269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305139243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72507730 + ... + 72507747.

Almost surely, 2^1305139293 is an apocalyptic number.

It is an amenable number.

1305139293 is a deficient number, since it is larger than the sum of its proper divisors (580061921).

1305139293 is a wasteful number, since it uses less digits than its factorization.

1305139293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145015483 (or 145015480 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 36.

The square root of 1305139293 is about 36126.7116272710. The cubic root of 1305139293 is about 1092.8291939979.

The spelling of 1305139293 in words is "one billion, three hundred five million, one hundred thirty-nine thousand, two hundred ninety-three".