1243320240 has 40 divisors (see below), whose sum is σ = 3854293488. Its totient is φ = 331552000.

The previous prime is 1243320229. The next prime is 1243320241. The reversal of 1243320240 is 420233421.

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

It is not an unprimeable number, because it can be changed into a prime (1243320241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2590011 + ... + 2590490.

Almost surely, 2^1243320240 is an apocalyptic number.

1243320240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243320240 is an abundant number, since it is smaller than the sum of its proper divisors (2610973248).

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

1243320240 is a wasteful number, since it uses less digits than its factorization.

1243320240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180517 (or 5180511 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 1243320240 is about 35260.7464470053. The cubic root of 1243320240 is about 1075.2951026856.

Adding to 1243320240 its reverse (420233421), we get a palindrome (1663553661).

The spelling of 1243320240 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, two hundred forty".