1243287616 has 56 divisors (see below), whose sum is σ = 2587971456. Its totient is φ = 591920640.

The previous prime is 1243287611. The next prime is 1243287641. The reversal of 1243287616 is 6167823421.

It is not an unprimeable number, because it can be changed into a prime (1243287611) 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, 105711 + ... + 116881.

It is an arithmetic number, because the mean of its divisors is an integer number (46213776).

Almost surely, 2^1243287616 is an apocalyptic number.

1243287616 is a gapful number since it is divisible by the number (16) 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 1243287616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1293985728).

1243287616 is an abundant number, since it is smaller than the sum of its proper divisors (1344683840).

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

1243287616 is a wasteful number, since it uses less digits than its factorization.

1243287616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11267 (or 11257 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 1243287616 is about 35260.2838332308. The cubic root of 1243287616 is about 1075.2856975640.

The spelling of 1243287616 in words is "one billion, two hundred forty-three million, two hundred eighty-seven thousand, six hundred sixteen".