1265337887 has 4 divisors (see below), whose sum is σ = 1380368616. Its totient is φ = 1150307160.

The previous prime is 1265337839. The next prime is 1265337907. The reversal of 1265337887 is 7887335621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1265337887 - 2⁸ = 1265337631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265337817) 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 3 ways as a sum of consecutive naturals, for example, 57515348 + ... + 57515369.

It is an arithmetic number, because the mean of its divisors is an integer number (345092154).

Almost surely, 2^1265337887 is an apocalyptic number.

1265337887 is a deficient number, since it is larger than the sum of its proper divisors (115030729).

1265337887 is a wasteful number, since it uses less digits than its factorization.

1265337887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115030728.

The product of its digits is 1693440, while the sum is 50.

The square root of 1265337887 is about 35571.5881990107. The cubic root of 1265337887 is about 1081.6053762654.

The spelling of 1265337887 in words is "one billion, two hundred sixty-five million, three hundred thirty-seven thousand, eight hundred eighty-seven".