1244440 has 32 divisors (see below), whose sum is σ = 2857680. Its totient is φ = 487552.

The previous prime is 1244437. The next prime is 1244447. The reversal of 1244440 is 444421.

1244440 = 281² + 282² + ... + 295².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1827 + ... + 2413.

2^1244440 is an apocalyptic number.

1244440 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 1244440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428840).

1244440 is an abundant number, since it is smaller than the sum of its proper divisors (1613240).

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

1244440 is a wasteful number, since it uses less digits than its factorization.

1244440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 1244440 is about 1115.5447099960. The cubic root of 1244440 is about 107.5617816849.

Subtracting from 1244440 its sum of digits (19), we obtain a palindrome (1244421).

Adding to 1244440 its reverse (444421), we get a palindrome (1688861).

The spelling of 1244440 in words is "one million, two hundred forty-four thousand, four hundred forty".