1243244240 has 80 divisors (see below), whose sum is σ = 3320882688. Its totient is φ = 424009728.

The previous prime is 1243244237. The next prime is 1243244263. The reversal of 1243244240 is 424423421.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

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, 102329 + ... + 113831.

Almost surely, 2^1243244240 is an apocalyptic number.

1243244240 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 1243244240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660441344).

1243244240 is an abundant number, since it is smaller than the sum of its proper divisors (2077638448).

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

1243244240 is a wasteful number, since it uses less digits than its factorization.

1243244240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11716 (or 11710 counting only the distinct ones).

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

The square root of 1243244240 is about 35259.6687448989. The cubic root of 1243244240 is about 1075.2731925104.

Adding to 1243244240 its reverse (424423421), we get a palindrome (1667667661).

The spelling of 1243244240 in words is "one billion, two hundred forty-three million, two hundred forty-four thousand, two hundred forty".