1312943720 has 64 divisors (see below), whose sum is σ = 3237373440. Its totient is φ = 475257600.

The previous prime is 1312943689. The next prime is 1312943729. The reversal of 1312943720 is 273492131.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1312943729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91430 + ... + 104810.

It is an arithmetic number, because the mean of its divisors is an integer number (50583960).

Almost surely, 2^1312943720 is an apocalyptic number.

1312943720 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 1312943720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1618686720).

1312943720 is an abundant number, since it is smaller than the sum of its proper divisors (1924429720).

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

1312943720 is a wasteful number, since it uses less digits than its factorization.

1312943720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13626 (or 13622 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1312943720 is about 36234.5652657790. The cubic root of 1312943720 is about 1095.0031539424.

The spelling of 1312943720 in words is "one billion, three hundred twelve million, nine hundred forty-three thousand, seven hundred twenty".