1220307318 has 48 divisors (see below), whose sum is σ = 2705742000. Its totient is φ = 397362240.

The previous prime is 1220307217. The next prime is 1220307331. The reversal of 1220307318 is 8137030221.

It is a junction number, because it is equal to n+sod(n) for n = 1220307291 and 1220307300.

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, 159873 + ... + 167331.

It is an arithmetic number, because the mean of its divisors is an integer number (56369625).

Almost surely, 2^1220307318 is an apocalyptic number.

1220307318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1220307318 is an abundant number, since it is smaller than the sum of its proper divisors (1485434682).

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

1220307318 is a wasteful number, since it uses less digits than its factorization.

1220307318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7677 (or 7674 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1220307318 is about 34932.8973605111. The cubic root of 1220307318 is about 1068.6194434960.

Adding to 1220307318 its reverse (8137030221), we get a palindrome (9357337539).

The spelling of 1220307318 in words is "one billion, two hundred twenty million, three hundred seven thousand, three hundred eighteen".