1244231440 has 40 divisors (see below), whose sum is σ = 2895861528. Its totient is φ = 497172480.

The previous prime is 1244231431. The next prime is 1244231441. The reversal of 1244231440 is 441324421.

It can be written as a sum of positive squares in 4 ways, for example, as 36529936 + 1207701504 = 6044^2 + 34752^2 .

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

It is a super-2 number, since 2×1244231440² = 3096223752568947200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1244231441) 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 7 ways as a sum of consecutive naturals, for example, 74064 + ... + 89296.

Almost surely, 2^1244231440 is an apocalyptic number.

1244231440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244231440 is an abundant number, since it is smaller than the sum of its proper divisors (1651630088).

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

1244231440 is a wasteful number, since it uses less digits than its factorization.

1244231440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16267 (or 16261 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 1244231440 is about 35273.6649641060. The cubic root of 1244231440 is about 1075.5577246565.

Adding to 1244231440 its reverse (441324421), we get a palindrome (1685555861).

The spelling of 1244231440 in words is "one billion, two hundred forty-four million, two hundred thirty-one thousand, four hundred forty".