1244020320 has 144 divisors (see below), whose sum is σ = 4429912032. Its totient is φ = 317306880.

The previous prime is 1244020313. The next prime is 1244020321. The reversal of 1244020320 is 230204421.

1244020320 is a `hidden beast` number, since 1 + 2 + 440 + 203 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 = 1244020293 and 1244020302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244020321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14340 + ... + 51900.

It is an arithmetic number, because the mean of its divisors is an integer number (30763278).

Almost surely, 2^1244020320 is an apocalyptic number.

1244020320 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 1244020320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2214956016).

1244020320 is an abundant number, since it is smaller than the sum of its proper divisors (3185891712).

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

1244020320 is a wasteful number, since it uses less digits than its factorization.

1244020320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37605 (or 37594 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1244020320 is about 35270.6722362929. The cubic root of 1244020320 is about 1075.4968880136.

Adding to 1244020320 its reverse (230204421), we get a palindrome (1474224741).

The spelling of 1244020320 in words is "one billion, two hundred forty-four million, twenty thousand, three hundred twenty".