1312340240 has 20 divisors (see below), whose sum is σ = 3051191244. Its totient is φ = 524936064.

The previous prime is 1312340231. The next prime is 1312340273. The reversal of 1312340240 is 420432131.

It can be written as a sum of positive squares in 2 ways, for example, as 531025936 + 781314304 = 23044^2 + 27952^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

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 3 ways as a sum of consecutive naturals, for example, 8202047 + ... + 8202206.

Almost surely, 2^1312340240 is an apocalyptic number.

1312340240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312340240 is an abundant number, since it is smaller than the sum of its proper divisors (1738851004).

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

1312340240 is a wasteful number, since it uses less digits than its factorization.

1312340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16404266 (or 16404260 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1312340240 is about 36226.2369008982. The cubic root of 1312340240 is about 1094.8353595518.

Adding to 1312340240 its reverse (420432131), we get a palindrome (1732772371).

The spelling of 1312340240 in words is "one billion, three hundred twelve million, three hundred forty thousand, two hundred forty".