1244408440 has 64 divisors (see below), whose sum is σ = 3059532000. Its totient is φ = 451760640.

The previous prime is 1244408411. The next prime is 1244408447. The reversal of 1244408440 is 448044421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244408447) 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 15 ways as a sum of consecutive naturals, for example, 309966 + ... + 313954.

Almost surely, 2^1244408440 is an apocalyptic number.

1244408440 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 1244408440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1529766000).

1244408440 is an abundant number, since it is smaller than the sum of its proper divisors (1815123560).

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

1244408440 is a wasteful number, since it uses less digits than its factorization.

1244408440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720 (or 4716 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 31.

The square root of 1244408440 is about 35276.1738288041. The cubic root of 1244408440 is about 1075.6087239279.

The spelling of 1244408440 in words is "one billion, two hundred forty-four million, four hundred eight thousand, four hundred forty".