1244220140 has 72 divisors (see below), whose sum is σ = 2794387680. Its totient is φ = 465246208.

The previous prime is 1244220139. The next prime is 1244220151. The reversal of 1244220140 is 410224421.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 964616 + ... + 965904.

It is an arithmetic number, because the mean of its divisors is an integer number (38810940).

Almost surely, 2^1244220140 is an apocalyptic number.

1244220140 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 1244220140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1397193840).

1244220140 is an abundant number, since it is smaller than the sum of its proper divisors (1550167540).

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

1244220140 is a wasteful number, since it uses less digits than its factorization.

1244220140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1244220140 is about 35273.5047875881. The cubic root of 1244220140 is about 1075.5544686065.

Adding to 1244220140 its reverse (410224421), we get a palindrome (1654444561).

The spelling of 1244220140 in words is "one billion, two hundred forty-four million, two hundred twenty thousand, one hundred forty".