1265288740 has 12 divisors (see below), whose sum is σ = 2657106396. Its totient is φ = 506115488.

The previous prime is 1265288729. The next prime is 1265288743. The reversal of 1265288740 is 478825621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 471063616 + 794225124 = 21704^2 + 28182^2 .

It is not an unprimeable number, because it can be changed into a prime (1265288743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31632199 + ... + 31632238.

It is an arithmetic number, because the mean of its divisors is an integer number (221425533).

Almost surely, 2^1265288740 is an apocalyptic number.

1265288740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265288740 is an abundant number, since it is smaller than the sum of its proper divisors (1391817656).

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

1265288740 is a wasteful number, since it uses less digits than its factorization.

1265288740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63264446 (or 63264444 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 1265288740 is about 35570.8973741175. The cubic root of 1265288740 is about 1081.5913725361.

The spelling of 1265288740 in words is "one billion, two hundred sixty-five million, two hundred eighty-eight thousand, seven hundred forty".