1265981472 has 288 divisors, whose sum is σ = 4347592704. Its totient is φ = 341798400.

The previous prime is 1265981443. The next prime is 1265981491. The reversal of 1265981472 is 2741895621.

1265981472 is a `hidden beast` number, since 12 + 6 + 598 + 1 + 47 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

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 47 ways as a sum of consecutive naturals, for example, 2937097 + ... + 2937527.

It is an arithmetic number, because the mean of its divisors is an integer number (15095808).

Almost surely, 2^1265981472 is an apocalyptic number.

1265981472 is a gapful number since it is divisible by the number (12) 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 1265981472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2173796352).

1265981472 is an abundant number, since it is smaller than the sum of its proper divisors (3081611232).

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

1265981472 is a wasteful number, since it uses less digits than its factorization.

1265981472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 521 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1265981472 is about 35580.6333839070. The cubic root of 1265981472 is about 1081.7887230792.

The spelling of 1265981472 in words is "one billion, two hundred sixty-five million, nine hundred eighty-one thousand, four hundred seventy-two".