1309199976 has 128 divisors (see below), whose sum is σ = 4197830400. Its totient is φ = 370310400.

The previous prime is 1309199963. The next prime is 1309199977. The reversal of 1309199976 is 6799919031.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1309199977) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 148426 + ... + 156998.

It is an arithmetic number, because the mean of its divisors is an integer number (32795550).

Almost surely, 2^1309199976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309199976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2098915200).

1309199976 is an abundant number, since it is smaller than the sum of its proper divisors (2888630424).

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

1309199976 is a wasteful number, since it uses less digits than its factorization.

1309199976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8696 (or 8686 counting only the distinct ones).

The product of its (nonzero) digits is 826686, while the sum is 54.

The square root of 1309199976 is about 36182.8685429997. The cubic root of 1309199976 is about 1093.9613946296.

The spelling of 1309199976 in words is "one billion, three hundred nine million, one hundred ninety-nine thousand, nine hundred seventy-six".