1275605 has 4 divisors (see below), whose sum is σ = 1530732. Its totient is φ = 1020480.

The previous prime is 1275601. The next prime is 1275611. The reversal of 1275605 is 5065721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5065721 = 691 ⋅7331.

It can be written as a sum of positive squares in 2 ways, for example, as 380689 + 894916 = 617^2 + 946^2 .

It is not a de Polignac number, because 1275605 - 2² = 1275601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 127556 + ... + 127565.

It is an arithmetic number, because the mean of its divisors is an integer number (382683).

2^1275605 is an apocalyptic number.

It is an amenable number.

1275605 is a deficient number, since it is larger than the sum of its proper divisors (255127).

1275605 is an equidigital number, since it uses as much as digits as its factorization.

1275605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255126.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 1275605 is about 1129.4268457939. The cubic root of 1275605 is about 108.4522927301.

The spelling of 1275605 in words is "one million, two hundred seventy-five thousand, six hundred five".