1265381877 has 8 divisors (see below), whose sum is σ = 1697527264. Its totient is φ = 838412208.

The previous prime is 1265381861. The next prime is 1265381881. The reversal of 1265381877 is 7781835621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1265381877 - 2⁴ = 1265381861 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 (1265381807) 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, 1293358 + ... + 1294335.

It is an arithmetic number, because the mean of its divisors is an integer number (212190908).

Almost surely, 2^1265381877 is an apocalyptic number.

It is an amenable number.

1265381877 is a deficient number, since it is larger than the sum of its proper divisors (432145387).

1265381877 is a wasteful number, since it uses less digits than its factorization.

1265381877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587859.

The product of its digits is 564480, while the sum is 48.

The square root of 1265381877 is about 35572.2065241953. The cubic root of 1265381877 is about 1081.6179102743.

The spelling of 1265381877 in words is "one billion, two hundred sixty-five million, three hundred eighty-one thousand, eight hundred seventy-seven".