1260395645 has 6 divisors (see below), whose sum is σ = 1512570042. Its totient is φ = 1008253008.

The previous prime is 1260395611. The next prime is 1260395659. The reversal of 1260395645 is 5465930621.

It can be written as a sum of positive squares in 3 ways, for example, as 992124004 + 268271641 = 31498^2 + 16379^2 .

It is not a de Polignac number, because 1260395645 - 2²² = 1256201341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71447 + ... + 87323.

It is an arithmetic number, because the mean of its divisors is an integer number (252095007).

Almost surely, 2^1260395645 is an apocalyptic number.

It is an amenable number.

1260395645 is a deficient number, since it is larger than the sum of its proper divisors (252174397).

1260395645 is an frugal number, since it uses more digits than its factorization.

1260395645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31759 (or 15882 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 1260395645 is about 35502.0512787642. The cubic root of 1260395645 is about 1080.1953364672.

The spelling of 1260395645 in words is "one billion, two hundred sixty million, three hundred ninety-five thousand, six hundred forty-five".