1305805806 has 32 divisors (see below), whose sum is σ = 2903040000. Its totient is φ = 435081240.

The previous prime is 1305805793. The next prime is 1305805807. The reversal of 1305805806 is 6085085031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305805807) 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 15 ways as a sum of consecutive naturals, for example, 185491 + ... + 192401.

It is an arithmetic number, because the mean of its divisors is an integer number (90720000).

Almost surely, 2^1305805806 is an apocalyptic number.

1305805806 is an abundant number, since it is smaller than the sum of its proper divisors (1597234194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1305805806 is a wasteful number, since it uses less digits than its factorization.

1305805806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10421 (or 10415 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1305805806 is about 36135.9351062070. The cubic root of 1305805806 is about 1093.0151922568.

The spelling of 1305805806 in words is "one billion, three hundred five million, eight hundred five thousand, eight hundred six".