1265287379 has 8 divisors (see below), whose sum is σ = 1283798880. Its totient is φ = 1246795200.

The previous prime is 1265287367. The next prime is 1265287399. The reversal of 1265287379 is 9737825621.

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

It is a cyclic number.

It is not a de Polignac number, because 1265287379 - 2⁴ = 1265287363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265287399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175457 + ... + 182525.

It is an arithmetic number, because the mean of its divisors is an integer number (160474860).

Almost surely, 2^1265287379 is an apocalyptic number.

1265287379 is a deficient number, since it is larger than the sum of its proper divisors (18511501).

1265287379 is an equidigital number, since it uses as much as digits as its factorization.

1265287379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9661.

The product of its digits is 1270080, while the sum is 50.

The square root of 1265287379 is about 35570.8782433046. The cubic root of 1265287379 is about 1081.5909847336.

The spelling of 1265287379 in words is "one billion, two hundred sixty-five million, two hundred eighty-seven thousand, three hundred seventy-nine".