1304641865 has 4 divisors (see below), whose sum is σ = 1565570244. Its totient is φ = 1043713488.

The previous prime is 1304641861. The next prime is 1304641951. The reversal of 1304641865 is 5681464031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5681464031 = 4793 ⋅1185367.

It can be written as a sum of positive squares in 2 ways, for example, as 635695369 + 668946496 = 25213^2 + 25864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304641865 - 2² = 1304641861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1304641861) 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 3 ways as a sum of consecutive naturals, for example, 130464182 + ... + 130464191.

It is an arithmetic number, because the mean of its divisors is an integer number (391392561).

Almost surely, 2^1304641865 is an apocalyptic number.

It is an amenable number.

1304641865 is a deficient number, since it is larger than the sum of its proper divisors (260928379).

1304641865 is an equidigital number, since it uses as much as digits as its factorization.

1304641865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260928378.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 1304641865 is about 36119.8264807571. The cubic root of 1304641865 is about 1092.6903396194.

The spelling of 1304641865 in words is "one billion, three hundred four million, six hundred forty-one thousand, eight hundred sixty-five".