1265315240 has 192 divisors, whose sum is σ = 3473830800. Its totient is φ = 413048832.

The previous prime is 1265315231. The next prime is 1265315243. The reversal of 1265315240 is 425135621.

It can be written as a sum of positive squares in 8 ways, for example, as 552532036 + 712783204 = 23506^2 + 26698^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (1265315243) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6422822 + ... + 6423018.

Almost surely, 2^1265315240 is an apocalyptic number.

1265315240 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 1265315240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1736915400).

1265315240 is an abundant number, since it is smaller than the sum of its proper divisors (2208515560).

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

1265315240 is a wasteful number, since it uses less digits than its factorization.

1265315240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1265315240 is about 35571.2698676896. The cubic root of 1265315240 is about 1081.5989233742.

The spelling of 1265315240 in words is "one billion, two hundred sixty-five million, three hundred fifteen thousand, two hundred forty".