1270440665 has 12 divisors (see below), whose sum is σ = 1642171692. Its totient is φ = 937959360.

The previous prime is 1270440659. The next prime is 1270440697. The reversal of 1270440665 is 5660440721.

1270440665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 11397376 + 1259043289 = 3376^2 + 35483^2 .

It is not a de Polignac number, because 1270440665 - 2¹⁶ = 1270375129 is a prime.

It is a super-2 number, since 2×1270440665² = 3228038966571284450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 285155 + ... + 289575.

It is an arithmetic number, because the mean of its divisors is an integer number (136847641).

Almost surely, 2^1270440665 is an apocalyptic number.

It is an amenable number.

1270440665 is a deficient number, since it is larger than the sum of its proper divisors (371731027).

1270440665 is an frugal number, since it uses more digits than its factorization.

1270440665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8860 (or 4439 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 1270440665 is about 35643.2415052279. The cubic root of 1270440665 is about 1083.0573703923.

The spelling of 1270440665 in words is "one billion, two hundred seventy million, four hundred forty thousand, six hundred sixty-five".