1312145440 has 48 divisors (see below), whose sum is σ = 3105345600. Its totient is φ = 523943680.

The previous prime is 1312145431. The next prime is 1312145479. The reversal of 1312145440 is 445412131.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 88995 + ... + 102685.

It is an arithmetic number, because the mean of its divisors is an integer number (64694700).

Almost surely, 2^1312145440 is an apocalyptic number.

1312145440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312145440 is an abundant number, since it is smaller than the sum of its proper divisors (1793200160).

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

1312145440 is a wasteful number, since it uses less digits than its factorization.

1312145440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14305 (or 14297 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1312145440 is about 36223.5481420581. The cubic root of 1312145440 is about 1094.7811854702.

Adding to 1312145440 its reverse (445412131), we get a palindrome (1757557571).

The spelling of 1312145440 in words is "one billion, three hundred twelve million, one hundred forty-five thousand, four hundred forty".