1312709240 has 64 divisors (see below), whose sum is σ = 3121092000. Its totient is φ = 495521280.

The previous prime is 1312709227. The next prime is 1312709249. The reversal of 1312709240 is 429072131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312709249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201230 + ... + 207650.

Almost surely, 2^1312709240 is an apocalyptic number.

1312709240 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 1312709240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560546000).

1312709240 is an abundant number, since it is smaller than the sum of its proper divisors (1808382760).

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

1312709240 is a wasteful number, since it uses less digits than its factorization.

1312709240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6720 (or 6716 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1312709240 is about 36231.3295367421. The cubic root of 1312709240 is about 1094.9379641398.

The spelling of 1312709240 in words is "one billion, three hundred twelve million, seven hundred nine thousand, two hundred forty".