1312222320 has 120 divisors (see below), whose sum is σ = 4448326896. Its totient is φ = 346635264.

The previous prime is 1312222313. The next prime is 1312222337. The reversal of 1312222320 is 232222131.

It is a tau number, because it is divible by the number of its divisors (120).

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 = 1312222293 and 1312222302.

It is a congruent number.

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, 68524 + ... + 85556.

Almost surely, 2^1312222320 is an apocalyptic number.

1312222320 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 1312222320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2224163448).

1312222320 is an abundant number, since it is smaller than the sum of its proper divisors (3136104576).

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

1312222320 is a wasteful number, since it uses less digits than its factorization.

1312222320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17159 (or 17150 counting only the distinct ones).

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

The square root of 1312222320 is about 36224.6093146634. The cubic root of 1312222320 is about 1094.8025665182.

Adding to 1312222320 its reverse (232222131), we get a palindrome (1544444451).

The spelling of 1312222320 in words is "one billion, three hundred twelve million, two hundred twenty-two thousand, three hundred twenty".