1265456838 has 16 divisors (see below), whose sum is σ = 2536116480. Its totient is φ = 420951816.

The previous prime is 1265456837. The next prime is 1265456873. The reversal of 1265456838 is 8386545621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265456837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213618 + ... + 219461.

It is an arithmetic number, because the mean of its divisors is an integer number (158507280).

Almost surely, 2^1265456838 is an apocalyptic number.

1265456838 is an abundant number, since it is smaller than the sum of its proper divisors (1270659642).

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

1265456838 is a wasteful number, since it uses less digits than its factorization.

1265456838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433571.

The product of its digits is 1382400, while the sum is 48.

The square root of 1265456838 is about 35573.2601542226. The cubic root of 1265456838 is about 1081.6392681375.

The spelling of 1265456838 in words is "one billion, two hundred sixty-five million, four hundred fifty-six thousand, eight hundred thirty-eight".