1309768 has 16 divisors (see below), whose sum is σ = 2481660. Its totient is φ = 648000.

The previous prime is 1309757. The next prime is 1309769. The reversal of 1309768 is 8679031.

It can be written as a sum of positive squares in 2 ways, for example, as 1077444 + 232324 = 1038^2 + 482^2 .

It is not an unprimeable number, because it can be changed into a prime (1309769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3 + ... + 1618.

2^1309768 is an apocalyptic number.

It is an amenable number.

1309768 is a deficient number, since it is larger than the sum of its proper divisors (1171892).

1309768 is a wasteful number, since it uses less digits than its factorization.

1309768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1309768 is about 1144.4509600678. The cubic root of 1309768 is about 109.4119584489.

The spelling of 1309768 in words is "one million, three hundred nine thousand, seven hundred sixty-eight".