1312246820 has 48 divisors (see below), whose sum is σ = 2841190128. Its totient is φ = 508784640.

The previous prime is 1312246811. The next prime is 1312246841. The reversal of 1312246820 is 286422131.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 152571904 + 1159674916 = 12352^2 + 34054^2 .

It is a super-2 number, since 2×1312246820² = 3443983433200224800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123644 + ... + 133836.

It is an arithmetic number, because the mean of its divisors is an integer number (59191461).

Almost surely, 2^1312246820 is an apocalyptic number.

1312246820 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 1312246820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1420595064).

1312246820 is an abundant number, since it is smaller than the sum of its proper divisors (1528943308).

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

1312246820 is a wasteful number, since it uses less digits than its factorization.

1312246820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10400 (or 10398 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1312246820 is about 36224.9474809833. The cubic root of 1312246820 is about 1094.8093800222.

Adding to 1312246820 its reverse (286422131), we get a palindrome (1598668951).

The spelling of 1312246820 in words is "one billion, three hundred twelve million, two hundred forty-six thousand, eight hundred twenty".