1275665 has 4 divisors (see below), whose sum is σ = 1530804. Its totient is φ = 1020528.

The previous prime is 1275661. The next prime is 1275667. The reversal of 1275665 is 5665721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 494209 + 781456 = 703^2 + 884^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275665 - 2² = 1275661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1275661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127562 + ... + 127571.

It is an arithmetic number, because the mean of its divisors is an integer number (382701).

2^1275665 is an apocalyptic number.

It is an amenable number.

1275665 is a deficient number, since it is larger than the sum of its proper divisors (255139).

1275665 is an equidigital number, since it uses as much as digits as its factorization.

1275665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255138.

The product of its digits is 12600, while the sum is 32.

The square root of 1275665 is about 1129.4534076269. The cubic root of 1275665 is about 108.4539931090.

It can be divided in two parts, 12756 and 65, that added together give a palindrome (12821).

The spelling of 1275665 in words is "one million, two hundred seventy-five thousand, six hundred sixty-five".