1243264896 has 128 divisors (see below), whose sum is σ = 3693542400. Its totient is φ = 411692544.

The previous prime is 1243264879. The next prime is 1243264901. The reversal of 1243264896 is 6984623421.

It is a tau number, because it is divible by the number of its divisors (128).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562225 + ... + 564431.

It is an arithmetic number, because the mean of its divisors is an integer number (28855800).

Almost surely, 2^1243264896 is an apocalyptic number.

1243264896 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 1243264896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1846771200).

1243264896 is an abundant number, since it is smaller than the sum of its proper divisors (2450277504).

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

1243264896 is a wasteful number, since it uses less digits than its factorization.

1243264896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393 (or 2375 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 1243264896 is about 35259.9616562469. The cubic root of 1243264896 is about 1075.2791475538.

The spelling of 1243264896 in words is "one billion, two hundred forty-three million, two hundred sixty-four thousand, eight hundred ninety-six".