1244111220 has 144 divisors (see below), whose sum is σ = 4249889280. Its totient is φ = 291859200.

The previous prime is 1244111179. The next prime is 1244111237. The reversal of 1244111220 is 221114421.

1244111220 is a `hidden beast` number, since 1 + 2 + 441 + 1 + 1 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1244111193 and 1244111202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51246 + ... + 71514.

It is an arithmetic number, because the mean of its divisors is an integer number (29513120).

Almost surely, 2^1244111220 is an apocalyptic number.

1244111220 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 1244111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2124944640).

1244111220 is an abundant number, since it is smaller than the sum of its proper divisors (3005778060).

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

1244111220 is a wasteful number, since it uses less digits than its factorization.

1244111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20326 (or 20321 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1244111220 is about 35271.9608187580. The cubic root of 1244111220 is about 1075.5230827321.

Adding to 1244111220 its reverse (221114421), we get a palindrome (1465225641).

The spelling of 1244111220 in words is "one billion, two hundred forty-four million, one hundred eleven thousand, two hundred twenty".