1322220312 has 144 divisors (see below), whose sum is σ = 4213474200. Its totient is φ = 373443840.

The previous prime is 1322220307. The next prime is 1322220331. The reversal of 1322220312 is 2130222231.

1322220312 is a `hidden beast` number, since 132 + 2 + 220 + 312 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 311887 + ... + 316097.

Almost surely, 2^1322220312 is an apocalyptic number.

1322220312 is a gapful number since it is divisible by the number (12) 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 1322220312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2106737100).

1322220312 is an abundant number, since it is smaller than the sum of its proper divisors (2891253888).

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

1322220312 is a wasteful number, since it uses less digits than its factorization.

1322220312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4326 (or 4312 counting only the distinct ones).

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

The square root of 1322220312 is about 36362.3474489753. The cubic root of 1322220312 is about 1097.5760155456.

Adding to 1322220312 its reverse (2130222231), we get a palindrome (3452442543).

The spelling of 1322220312 in words is "one billion, three hundred twenty-two million, two hundred twenty thousand, three hundred twelve".