1312231340 has 24 divisors (see below), whose sum is σ = 3149355552. Its totient is φ = 449907840.

The previous prime is 1312231339. The next prime is 1312231369. The reversal of 1312231340 is 431322131.

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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4686401 + ... + 4686680.

It is an arithmetic number, because the mean of its divisors is an integer number (131223148).

Almost surely, 2^1312231340 is an apocalyptic number.

1312231340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312231340 is an abundant number, since it is smaller than the sum of its proper divisors (1837124212).

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

1312231340 is a wasteful number, since it uses less digits than its factorization.

1312231340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9373097 (or 9373095 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1312231340 is about 36224.7338154471. The cubic root of 1312231340 is about 1094.8050750099.

Adding to 1312231340 its reverse (431322131), we get a palindrome (1743553471).

The spelling of 1312231340 in words is "one billion, three hundred twelve million, two hundred thirty-one thousand, three hundred forty".