1243015340 has 144 divisors (see below), whose sum is σ = 3221174880. Its totient is φ = 400619520.

The previous prime is 1243015297. The next prime is 1243015349. The reversal of 1243015340 is 435103421.

It is not an unprimeable number, because it can be changed into a prime (1243015349) 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, 4487282 + ... + 4487558.

It is an arithmetic number, because the mean of its divisors is an integer number (22369270).

Almost surely, 2^1243015340 is an apocalyptic number.

1243015340 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 1243015340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1610587440).

1243015340 is an abundant number, since it is smaller than the sum of its proper divisors (1978159540).

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

1243015340 is a wasteful number, since it uses less digits than its factorization.

1243015340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1243015340 is about 35256.4226772938. The cubic root of 1243015340 is about 1075.2071971270.

Adding to 1243015340 its reverse (435103421), we get a palindrome (1678118761).

The spelling of 1243015340 in words is "one billion, two hundred forty-three million, fifteen thousand, three hundred forty".