1265859288 has 96 divisors (see below), whose sum is σ = 3490755840. Its totient is φ = 414348480.

The previous prime is 1265859271. The next prime is 1265859307. The reversal of 1265859288 is 8829585621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 970845 + ... + 972147.

It is an arithmetic number, because the mean of its divisors is an integer number (36362040).

Almost surely, 2^1265859288 is an apocalyptic number.

1265859288 is a gapful number since it is divisible by the number (18) 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 1265859288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1745377920).

1265859288 is an abundant number, since it is smaller than the sum of its proper divisors (2224896552).

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

1265859288 is a wasteful number, since it uses less digits than its factorization.

1265859288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549 (or 1542 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 54.

The square root of 1265859288 is about 35578.9163410017. The cubic root of 1265859288 is about 1081.7539196405.

The spelling of 1265859288 in words is "one billion, two hundred sixty-five million, eight hundred fifty-nine thousand, two hundred eighty-eight".