1244320440 has 288 divisors, whose sum is σ = 4406587920. Its totient is φ = 279910400.

The previous prime is 1244320421. The next prime is 1244320453. The reversal of 1244320440 is 440234421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1244320440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 17525605 + ... + 17525675.

Almost surely, 2^1244320440 is an apocalyptic number.

1244320440 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 1244320440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203293960).

1244320440 is an abundant number, since it is smaller than the sum of its proper divisors (3162267480).

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

1244320440 is a wasteful number, since it uses less digits than its factorization.

1244320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 1244320440 is about 35274.9265059475. The cubic root of 1244320440 is about 1075.5833689624.

Adding to 1244320440 its reverse (440234421), we get a palindrome (1684554861).

The spelling of 1244320440 in words is "one billion, two hundred forty-four million, three hundred twenty thousand, four hundred forty".