1243261264 has 40 divisors (see below), whose sum is σ = 2773983168. Its totient is φ = 528752640.

The previous prime is 1243261247. The next prime is 1243261267. The reversal of 1243261264 is 4621623421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243261267) 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, 27697 + ... + 57040.

Almost surely, 2^1243261264 is an apocalyptic number.

1243261264 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1243261264 is an abundant number, since it is smaller than the sum of its proper divisors (1530721904).

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

1243261264 is a wasteful number, since it uses less digits than its factorization.

1243261264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84883 (or 84877 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 1243261264 is about 35259.9101530336. The cubic root of 1243261264 is about 1075.2781004673.

Adding to 1243261264 its reverse (4621623421), we get a palindrome (5864884685).

It can be divided in two parts, 12432612 and 64, that added together give a square (12432676 = 3526²).

The spelling of 1243261264 in words is "one billion, two hundred forty-three million, two hundred sixty-one thousand, two hundred sixty-four".