1265985327 has 4 divisors (see below), whose sum is σ = 1687980440. Its totient is φ = 843990216.

The previous prime is 1265985307. The next prime is 1265985337. The reversal of 1265985327 is 7235895621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7235895621 = 3 ⋅2411965207.

It is not a de Polignac number, because 1265985327 - 2⁶ = 1265985263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265985307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210997552 + ... + 210997557.

It is an arithmetic number, because the mean of its divisors is an integer number (421995110).

Almost surely, 2^1265985327 is an apocalyptic number.

1265985327 is a deficient number, since it is larger than the sum of its proper divisors (421995113).

1265985327 is an equidigital number, since it uses as much as digits as its factorization.

1265985327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421995112.

The product of its digits is 907200, while the sum is 48.

The square root of 1265985327 is about 35580.6875565945. The cubic root of 1265985327 is about 1081.7898211183.

The spelling of 1265985327 in words is "one billion, two hundred sixty-five million, nine hundred eighty-five thousand, three hundred twenty-seven".