1305249806 has 16 divisors (see below), whose sum is σ = 2314729440. Its totient is φ = 540103200.

The previous prime is 1305249733. The next prime is 1305249811. The reversal of 1305249806 is 6089425031.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1305249806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1607045 + ... + 1607856.

It is an arithmetic number, because the mean of its divisors is an integer number (144670590).

Almost surely, 2^1305249806 is an apocalyptic number.

1305249806 is a deficient number, since it is larger than the sum of its proper divisors (1009479634).

1305249806 is a wasteful number, since it uses less digits than its factorization.

1305249806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214939.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 1305249806 is about 36128.2411141201. The cubic root of 1305249806 is about 1092.8600383235.

The spelling of 1305249806 in words is "one billion, three hundred five million, two hundred forty-nine thousand, eight hundred six".