1312720765 has 8 divisors (see below), whose sum is σ = 1585698048. Its totient is φ = 1043221200.

The previous prime is 1312720753. The next prime is 1312720771. The reversal of 1312720765 is 5670272131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1312720765 - 2¹³ = 1312712573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312720765.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868597 + ... + 870106.

It is an arithmetic number, because the mean of its divisors is an integer number (198212256).

Almost surely, 2^1312720765 is an apocalyptic number.

It is an amenable number.

1312720765 is a deficient number, since it is larger than the sum of its proper divisors (272977283).

1312720765 is a wasteful number, since it uses less digits than its factorization.

1312720765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738859.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 1312720765 is about 36231.4885838272. The cubic root of 1312720765 is about 1094.9411684856.

Adding to 1312720765 its reverse (5670272131), we get a palindrome (6982992896).

The spelling of 1312720765 in words is "one billion, three hundred twelve million, seven hundred twenty thousand, seven hundred sixty-five".