1312315540 has 48 divisors (see below), whose sum is σ = 2863123200. Its totient is φ = 504651392.

The previous prime is 1312315489. The next prime is 1312315597. The reversal of 1312315540 is 455132131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 133887 + ... + 143353.

It is an arithmetic number, because the mean of its divisors is an integer number (59648400).

Almost surely, 2^1312315540 is an apocalyptic number.

1312315540 is a gapful number since it is divisible by the number (10) 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 1312315540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431561600).

1312315540 is an abundant number, since it is smaller than the sum of its proper divisors (1550807660).

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

1312315540 is a wasteful number, since it uses less digits than its factorization.

1312315540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9744 (or 9742 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1312315540 is about 36225.8959861589. The cubic root of 1312315540 is about 1094.8284907530.

Adding to 1312315540 its reverse (455132131), we get a palindrome (1767447671).

The spelling of 1312315540 in words is "one billion, three hundred twelve million, three hundred fifteen thousand, five hundred forty".