1265493312 has 84 divisors (see below), whose sum is σ = 3686874516. Its totient is φ = 414904320.

The previous prime is 1265493287. The next prime is 1265493323. The reversal of 1265493312 is 2133945621.

It can be written as a sum of positive squares in 2 ways, for example, as 283046976 + 982446336 = 16824^2 + 31344^2 .

It is a super-3 number, since 3×1265493312³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17128 + ... + 53144.

Almost surely, 2^1265493312 is an apocalyptic number.

1265493312 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 1265493312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1843437258).

1265493312 is an abundant number, since it is smaller than the sum of its proper divisors (2421381204).

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

1265493312 is a wasteful number, since it uses less digits than its factorization.

1265493312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36096 (or 36083 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 1265493312 is about 35573.7728108785. The cubic root of 1265493312 is about 1081.6496599925.

The spelling of 1265493312 in words is "one billion, two hundred sixty-five million, four hundred ninety-three thousand, three hundred twelve".