1276397 has 2 divisors, whose sum is σ = 1276398. Its totient is φ = 1276396.

The previous prime is 1276361. The next prime is 1276409. The reversal of 1276397 is 7936721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784996 + 491401 = 886^2 + 701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1276397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638198 + 638199.

It is an arithmetic number, because the mean of its divisors is an integer number (638199).

2^1276397 is an apocalyptic number.

It is an amenable number.

1276397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276397 is an equidigital number, since it uses as much as digits as its factorization.

1276397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 35.

The square root of 1276397 is about 1129.7774117055. Note that the first 3 decimals coincide. The cubic root of 1276397 is about 108.4747334400.

The spelling of 1276397 in words is "one million, two hundred seventy-six thousand, three hundred ninety-seven".