1220423112 has 40 divisors (see below), whose sum is σ = 3418316550. Its totient is φ = 406807488.

The previous prime is 1220423111. The next prime is 1220423123. The reversal of 1220423112 is 2113240221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 751527396 + 468895716 = 27414^2 + 21654^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1220423111) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 941037 + ... + 942332.

Almost surely, 2^1220423112 is an apocalyptic number.

1220423112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220423112 is an abundant number, since it is smaller than the sum of its proper divisors (2197893438).

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

1220423112 is a wasteful number, since it uses less digits than its factorization.

1220423112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883387 (or 1883374 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1220423112 is about 34934.5546987506. The cubic root of 1220423112 is about 1068.6532425794.

Adding to 1220423112 its reverse (2113240221), we get a palindrome (3333663333).

The spelling of 1220423112 in words is "one billion, two hundred twenty million, four hundred twenty-three thousand, one hundred twelve".