1305005606 has 4 divisors (see below), whose sum is σ = 1957508412. Its totient is φ = 652502802.

The previous prime is 1305005599. The next prime is 1305005609. The reversal of 1305005606 is 6065005031.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305005609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326251400 + ... + 326251403.

It is an arithmetic number, because the mean of its divisors is an integer number (489377103).

Almost surely, 2^1305005606 is an apocalyptic number.

1305005606 is a deficient number, since it is larger than the sum of its proper divisors (652502806).

1305005606 is an equidigital number, since it uses as much as digits as its factorization.

1305005606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652502805.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1305005606 is about 36124.8613284536. The cubic root of 1305005606 is about 1092.7918794507.

The spelling of 1305005606 in words is "one billion, three hundred five million, five thousand, six hundred six".