1312378369 has 4 divisors (see below), whose sum is σ = 1321820080. Its totient is φ = 1302936660.

The previous prime is 1312378357. The next prime is 1312378373. The reversal of 1312378369 is 9638732131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1312378369 - 2⁵ = 1312378337 is a prime.

It is a super-2 number, since 2×1312378369² = 3444673966838200322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312378399) 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, 4720647 + ... + 4720924.

It is an arithmetic number, because the mean of its divisors is an integer number (330455020).

Almost surely, 2^1312378369 is an apocalyptic number.

It is an amenable number.

1312378369 is a deficient number, since it is larger than the sum of its proper divisors (9441711).

1312378369 is an equidigital number, since it uses as much as digits as its factorization.

1312378369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9441710.

The product of its digits is 163296, while the sum is 43.

The square root of 1312378369 is about 36226.7631592998. The cubic root of 1312378369 is about 1094.8459626388.

The spelling of 1312378369 in words is "one billion, three hundred twelve million, three hundred seventy-eight thousand, three hundred sixty-nine".