1309764643 has 16 divisors (see below), whose sum is σ = 1514112480. Its totient is φ = 1119744000.

The previous prime is 1309764641. The next prime is 1309764653. The reversal of 1309764643 is 3464679031.

It is a cyclic number.

It is not a de Polignac number, because 1309764643 - 2¹ = 1309764641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1309764643.

It is not an unprimeable number, because it can be changed into a prime (1309764641) 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 15 ways as a sum of consecutive naturals, for example, 334843 + ... + 338731.

It is an arithmetic number, because the mean of its divisors is an integer number (94632030).

Almost surely, 2^1309764643 is an apocalyptic number.

1309764643 is a deficient number, since it is larger than the sum of its proper divisors (204347837).

1309764643 is a wasteful number, since it uses less digits than its factorization.

1309764643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5718.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 1309764643 is about 36190.6706624787. The cubic root of 1309764643 is about 1094.1186497273.

The spelling of 1309764643 in words is "one billion, three hundred nine million, seven hundred sixty-four thousand, six hundred forty-three".