1312322220 has 72 divisors (see below), whose sum is σ = 4342600080. Its totient is φ = 318138240.

The previous prime is 1312322171. The next prime is 1312322243. The reversal of 1312322220 is 222232131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1312322193 and 1312322202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 329415 + ... + 333374.

It is an arithmetic number, because the mean of its divisors is an integer number (60313890).

Almost surely, 2^1312322220 is an apocalyptic number.

1312322220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312322220 is an abundant number, since it is smaller than the sum of its proper divisors (3030277860).

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

1312322220 is a wasteful number, since it uses less digits than its factorization.

1312322220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662815 (or 662810 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1312322220 is about 36225.9881852794. The cubic root of 1312322220 is about 1094.8303483962.

Adding to 1312322220 its reverse (222232131), we get a palindrome (1534554351).

The spelling of 1312322220 in words is "one billion, three hundred twelve million, three hundred twenty-two thousand, two hundred twenty".