1312403456 has 156 divisors (see below), whose sum is σ = 3294354672. Its totient is φ = 518160384.

The previous prime is 1312403453. The next prime is 1312403531. The reversal of 1312403456 is 6543042131.

It is not an unprimeable number, because it can be changed into a prime (1312403453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2608901 + ... + 2609403.

Almost surely, 2^1312403456 is an apocalyptic number.

1312403456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312403456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1647177336).

1312403456 is an abundant number, since it is smaller than the sum of its proper divisors (1981951216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312403456 is an equidigital number, since it uses as much as digits as its factorization.

1312403456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 525 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1312403456 is about 36227.1094071829. The cubic root of 1312403456 is about 1094.8529388346.

Adding to 1312403456 its reverse (6543042131), we get a palindrome (7855445587).

The spelling of 1312403456 in words is "one billion, three hundred twelve million, four hundred three thousand, four hundred fifty-six".