1265213320 has 96 divisors (see below), whose sum is σ = 3349171800. Its totient is φ = 428854272.

The previous prime is 1265213317. The next prime is 1265213353. The reversal of 1265213320 is 233125621.

It can be written as a sum of positive squares in 4 ways, for example, as 963357444 + 301855876 = 31038^2 + 17374^2 .

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, 170814 + ... + 178066.

Almost surely, 2^1265213320 is an apocalyptic number.

1265213320 is a gapful number since it is divisible by the number (10) 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 1265213320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1674585900).

1265213320 is an abundant number, since it is smaller than the sum of its proper divisors (2083958480).

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

1265213320 is a wasteful number, since it uses less digits than its factorization.

1265213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7367 (or 7356 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1265213320 is about 35569.8372220060. The cubic root of 1265213320 is about 1081.5698819889.

Adding to 1265213320 its reverse (233125621), we get a palindrome (1498338941).

The spelling of 1265213320 in words is "one billion, two hundred sixty-five million, two hundred thirteen thousand, three hundred twenty".