12220312 has 16 divisors (see below), whose sum is σ = 24675840. Its totient is φ = 5640096.

The previous prime is 12220301. The next prime is 12220333. The reversal of 12220312 is 21302221.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 12220292 and 12220301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58648 + ... + 58855.

It is an arithmetic number, because the mean of its divisors is an integer number (1542240).

Almost surely, 2^12220312 is an apocalyptic number.

It is an amenable number.

12220312 is an abundant number, since it is smaller than the sum of its proper divisors (12455528).

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

12220312 is a wasteful number, since it uses less digits than its factorization.

12220312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117522 (or 117518 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 12220312 is about 3495.7562844111. The cubic root of 12220312 is about 230.3354399715.

Adding to 12220312 its reverse (21302221), we get a palindrome (33522533).

The spelling of 12220312 in words is "twelve million, two hundred twenty thousand, three hundred twelve".