1200020112 has 120 divisors (see below), whose sum is σ = 3494042240. Its totient is φ = 384134400.

The previous prime is 1200020093. The next prime is 1200020141. The reversal of 1200020112 is 2110200021.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1200020094 and 1200020103.

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, 419487 + ... + 422337.

Almost surely, 2^1200020112 is an apocalyptic number.

1200020112 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 1200020112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1747021120).

1200020112 is an abundant number, since it is smaller than the sum of its proper divisors (2294022128).

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

1200020112 is a wasteful number, since it uses less digits than its factorization.

1200020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981 (or 2972 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1200020112 is about 34641.3064418766. The cubic root of 1200020112 is about 1062.6645058687.

Adding to 1200020112 its reverse (2110200021), we get a palindrome (3310220133).

The spelling of 1200020112 in words is "one billion, two hundred million, twenty thousand, one hundred twelve".