1309630806 has 48 divisors (see below), whose sum is σ = 3107040768. Its totient is φ = 395377200.

The previous prime is 1309630801. The next prime is 1309630811. The reversal of 1309630806 is 6080369031.

It is a happy number.

1309630806 is a `hidden beast` number, since 13 + 0 + 9 + 630 + 8 + 0 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (1309630801) and next prime (1309630811).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309630801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41455 + ... + 65861.

It is an arithmetic number, because the mean of its divisors is an integer number (64730016).

Almost surely, 2^1309630806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309630806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553520384).

1309630806 is an abundant number, since it is smaller than the sum of its proper divisors (1797409962).

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

1309630806 is a wasteful number, since it uses less digits than its factorization.

1309630806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24697 (or 24694 counting only the distinct ones).

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

The square root of 1309630806 is about 36188.8215613606. The cubic root of 1309630806 is about 1094.0813813151.

Adding to 1309630806 its reverse (6080369031), we get a palindrome (7389999837).

The spelling of 1309630806 in words is "one billion, three hundred nine million, six hundred thirty thousand, eight hundred six".