1243255240 has 64 divisors (see below), whose sum is σ = 2846016000. Its totient is φ = 488716800.

The previous prime is 1243255231. The next prime is 1243255249. The reversal of 1243255240 is 425523421.

It is an interprime number because it is at equal distance from previous prime (1243255231) and next prime (1243255249).

It is a junction number, because it is equal to n+sod(n) for n = 1243255199 and 1243255208.

It is not an unprimeable number, because it can be changed into a prime (1243255249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636265 + ... + 638215.

It is an arithmetic number, because the mean of its divisors is an integer number (44469000).

Almost surely, 2^1243255240 is an apocalyptic number.

1243255240 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 1243255240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1423008000).

1243255240 is an abundant number, since it is smaller than the sum of its proper divisors (1602760760).

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

1243255240 is a wasteful number, since it uses less digits than its factorization.

1243255240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230 (or 2226 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 1243255240 is about 35259.8247301373. The cubic root of 1243255240 is about 1075.2763637752.

Adding to 1243255240 its reverse (425523421), we get a palindrome (1668778661).

The spelling of 1243255240 in words is "one billion, two hundred forty-three million, two hundred fifty-five thousand, two hundred forty".