1243120120 has 96 divisors (see below), whose sum is σ = 3106071360. Its totient is φ = 447392000.

The previous prime is 1243120027. The next prime is 1243120199. The reversal of 1243120120 is 210213421.

It is a junction number, because it is equal to n+sod(n) for n = 1243120094 and 1243120103.

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, 487569 + ... + 490111.

It is an arithmetic number, because the mean of its divisors is an integer number (32354910).

Almost surely, 2^1243120120 is an apocalyptic number.

1243120120 is a gapful number since it is divisible by the number (10) 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 1243120120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553035680).

1243120120 is an abundant number, since it is smaller than the sum of its proper divisors (1862951240).

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

1243120120 is a wasteful number, since it uses less digits than its factorization.

1243120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677 (or 2662 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1243120120 is about 35257.9086163658. The cubic root of 1243120120 is about 1075.2374078147.

Adding to 1243120120 its reverse (210213421), we get a palindrome (1453333541).

The spelling of 1243120120 in words is "one billion, two hundred forty-three million, one hundred twenty thousand, one hundred twenty".