1265394945 has 16 divisors (see below), whose sum is σ = 2025781632. Its totient is φ = 674494080.

The previous prime is 1265394913. The next prime is 1265394971. The reversal of 1265394945 is 5494935621.

It is not a de Polignac number, because 1265394945 - 2⁵ = 1265394913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1265394894 and 1265394903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4429 + ... + 50501.

It is an arithmetic number, because the mean of its divisors is an integer number (126611352).

Almost surely, 2^1265394945 is an apocalyptic number.

1265394945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265394945 is a deficient number, since it is larger than the sum of its proper divisors (760386687).

1265394945 is a wasteful number, since it uses less digits than its factorization.

1265394945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47912.

The product of its digits is 1166400, while the sum is 48.

The square root of 1265394945 is about 35572.3902064508. The cubic root of 1265394945 is about 1081.6216336652.

The spelling of 1265394945 in words is "one billion, two hundred sixty-five million, three hundred ninety-four thousand, nine hundred forty-five".