1243155264 has 112 divisors (see below), whose sum is σ = 3617902848. Its totient is φ = 374335488.

The previous prime is 1243155239. The next prime is 1243155271. The reversal of 1243155264 is 4625513421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112014 + ... + 122610.

It is an arithmetic number, because the mean of its divisors is an integer number (32302704).

Almost surely, 2^1243155264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243155264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1808951424).

1243155264 is an abundant number, since it is smaller than the sum of its proper divisors (2374747584).

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

1243155264 is a wasteful number, since it uses less digits than its factorization.

1243155264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10672 (or 10662 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 1243155264 is about 35258.4069974808. The cubic root of 1243155264 is about 1075.2475403264.

Adding to 1243155264 its reverse (4625513421), we get a palindrome (5868668685).

The spelling of 1243155264 in words is "one billion, two hundred forty-three million, one hundred fifty-five thousand, two hundred sixty-four".