1275997 has 4 divisors (see below), whose sum is σ = 1278396. Its totient is φ = 1273600.

The previous prime is 1275979. The next prime is 1276001. The reversal of 1275997 is 7995721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7995721 = 43 ⋅185947.

It can be written as a sum of positive squares in 2 ways, for example, as 1058841 + 217156 = 1029^2 + 466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1275997 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 (1275947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4 + ... + 1597.

It is an arithmetic number, because the mean of its divisors is an integer number (319599).

2^1275997 is an apocalyptic number.

It is an amenable number.

1275997 is a deficient number, since it is larger than the sum of its proper divisors (2399).

1275997 is an equidigital number, since it uses as much as digits as its factorization.

1275997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398.

The product of its digits is 39690, while the sum is 40.

The square root of 1275997 is about 1129.6003718130. The cubic root of 1275997 is about 108.4634009087.

The spelling of 1275997 in words is "one million, two hundred seventy-five thousand, nine hundred ninety-seven".