1312305240 has 64 divisors (see below), whose sum is σ = 3977537760. Its totient is φ = 346337280.

The previous prime is 1312305229. The next prime is 1312305289. The reversal of 1312305240 is 425032131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44731 + ... + 68010.

Almost surely, 2^1312305240 is an apocalyptic number.

1312305240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312305240 is an abundant number, since it is smaller than the sum of its proper divisors (2665232520).

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

1312305240 is a wasteful number, since it uses less digits than its factorization.

1312305240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112852 (or 112848 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1312305240 is about 36225.7538223844. The cubic root of 1312305240 is about 1094.8256264107.

Adding to 1312305240 its reverse (425032131), we get a palindrome (1737337371).

The spelling of 1312305240 in words is "one billion, three hundred twelve million, three hundred five thousand, two hundred forty".