1243446240 has 288 divisors, whose sum is σ = 4214125440. Its totient is φ = 308036608.

The previous prime is 1243446223. The next prime is 1243446247. The reversal of 1243446240 is 426443421.

1243446240 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1243446198 and 1243446207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243446247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14981239 + ... + 14981321.

It is an arithmetic number, because the mean of its divisors is an integer number (14632380).

Almost surely, 2^1243446240 is an apocalyptic number.

1243446240 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 1243446240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2107062720).

1243446240 is an abundant number, since it is smaller than the sum of its proper divisors (2970679200).

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

1243446240 is a wasteful number, since it uses less digits than its factorization.

1243446240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 1243446240 is about 35262.5330910869. The cubic root of 1243446240 is about 1075.3314254827.

Adding to 1243446240 its reverse (426443421), we get a palindrome (1669889661).

The spelling of 1243446240 in words is "one billion, two hundred forty-three million, four hundred forty-six thousand, two hundred forty".