1265240240 has 40 divisors (see below), whose sum is σ = 3209111568. Its totient is φ = 460087040.

The previous prime is 1265240237. The next prime is 1265240341. The reversal of 1265240240 is 420425621.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718007 + ... + 719766.

Almost surely, 2^1265240240 is an apocalyptic number.

1265240240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265240240 is an abundant number, since it is smaller than the sum of its proper divisors (1943871328).

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

1265240240 is a wasteful number, since it uses less digits than its factorization.

1265240240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437797 (or 1437791 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1265240240 is about 35570.2156304963. The cubic root of 1265240240 is about 1081.5775528046.

Adding to 1265240240 its reverse (420425621), we get a palindrome (1685665861).

The spelling of 1265240240 in words is "one billion, two hundred sixty-five million, two hundred forty thousand, two hundred forty".