1265004312 has 128 divisors (see below), whose sum is σ = 3741534720. Its totient is φ = 351360000.

The previous prime is 1265004281. The next prime is 1265004313. The reversal of 1265004312 is 2134005621.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265004313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 517012 + ... + 519452.

It is an arithmetic number, because the mean of its divisors is an integer number (29230740).

Almost surely, 2^1265004312 is an apocalyptic number.

1265004312 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 1265004312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1870767360).

1265004312 is an abundant number, since it is smaller than the sum of its proper divisors (2476530408).

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

1265004312 is a wasteful number, since it uses less digits than its factorization.

1265004312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625 (or 2621 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1265004312 is about 35566.8991057697. The cubic root of 1265004312 is about 1081.5103217542.

Adding to 1265004312 its reverse (2134005621), we get a palindrome (3399009933).

The spelling of 1265004312 in words is "one billion, two hundred sixty-five million, four thousand, three hundred twelve".