1304273665 has 4 divisors (see below), whose sum is σ = 1565128404. Its totient is φ = 1043418928.

The previous prime is 1304273651. The next prime is 1304273671. The reversal of 1304273665 is 5663724031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 829382401 + 474891264 = 28799^2 + 21792^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304273665 - 2²³ = 1295885057 is a prime.

It is a super-2 number, since 2×1304273665² = 3402259586425064450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130427362 + ... + 130427371.

It is an arithmetic number, because the mean of its divisors is an integer number (391282101).

Almost surely, 2^1304273665 is an apocalyptic number.

It is an amenable number.

1304273665 is a deficient number, since it is larger than the sum of its proper divisors (260854739).

1304273665 is an equidigital number, since it uses as much as digits as its factorization.

1304273665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260854738.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 1304273665 is about 36114.7291973787. The cubic root of 1304273665 is about 1092.5875358159.

Adding to 1304273665 its reverse (5663724031), we get a palindrome (6967997696).

The spelling of 1304273665 in words is "one billion, three hundred four million, two hundred seventy-three thousand, six hundred sixty-five".