1312302440 has 16 divisors (see below), whose sum is σ = 2952680580. Its totient is φ = 524920960.

The previous prime is 1312302379. The next prime is 1312302449. The reversal of 1312302440 is 442032131.

It can be written as a sum of positive squares in 2 ways, for example, as 1298449156 + 13853284 = 36034^2 + 3722^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1312302449) 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, 16403741 + ... + 16403820.

Almost surely, 2^1312302440 is an apocalyptic number.

1312302440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312302440 is an abundant number, since it is smaller than the sum of its proper divisors (1640378140).

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

1312302440 is a wasteful number, since it uses less digits than its factorization.

1312302440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32807572 (or 32807568 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1312302440 is about 36225.7151758250. The cubic root of 1312302440 is about 1094.8248477519.

Adding to 1312302440 its reverse (442032131), we get a palindrome (1754334571).

The spelling of 1312302440 in words is "one billion, three hundred twelve million, three hundred two thousand, four hundred forty".