1244043440 has 40 divisors (see below), whose sum is σ = 2893877280. Its totient is φ = 497363456.

The previous prime is 1244043431. The next prime is 1244043473. The reversal of 1244043440 is 443404421.

It is a happy number.

It is a Cunningham number, because it is equal to 35271²-1.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279956 + ... + 284364.

It is an arithmetic number, because the mean of its divisors is an integer number (72346932).

Almost surely, 2^1244043440 is an apocalyptic number.

1244043440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244043440 is an abundant number, since it is smaller than the sum of its proper divisors (1649833840).

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

1244043440 is a wasteful number, since it uses less digits than its factorization.

1244043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949 (or 7943 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 1244043440 is about 35270.9999858240. Note that the first 4 decimals coincide. The cubic root of 1244043440 is about 1075.5035506417.

Adding to 1244043440 its reverse (443404421), we get a palindrome (1687447861).

The spelling of 1244043440 in words is "one billion, two hundred forty-four million, forty-three thousand, four hundred forty".