1275818 has 4 divisors (see below), whose sum is σ = 1913730. Its totient is φ = 637908.

The previous prime is 1275817. The next prime is 1275823. The reversal of 1275818 is 8185721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8185721 = 17 ⋅481513.

It can be written as a sum of positive squares in only one way, i.e., 1181569 + 94249 = 1087^2 + 307^2 .

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1275817) 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 as a sum of consecutive naturals, namely, 318953 + ... + 318956.

2^1275818 is an apocalyptic number.

1275818 is a deficient number, since it is larger than the sum of its proper divisors (637912).

1275818 is an equidigital number, since it uses as much as digits as its factorization.

1275818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637911.

The product of its digits is 4480, while the sum is 32.

The square root of 1275818 is about 1129.5211374738. The cubic root of 1275818 is about 108.4583288339.

Subtracting 1275818 from its reverse (8185721), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1275818 in words is "one million, two hundred seventy-five thousand, eight hundred eighteen".