1279997 has 2 divisors, whose sum is σ = 1279998. Its totient is φ = 1279996.

The previous prime is 1279969. The next prime is 1280023. The reversal of 1279997 is 7999721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1136356 + 143641 = 1066^2 + 379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279997 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 (1279907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639998 + 639999.

It is an arithmetic number, because the mean of its divisors is an integer number (639999).

2^1279997 is an apocalyptic number.

It is an amenable number.

1279997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279997 is an equidigital number, since it uses as much as digits as its factorization.

1279997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 44.

The square root of 1279997 is about 1131.3695240725. The cubic root of 1279997 is about 108.5766198382.

The spelling of 1279997 in words is "one million, two hundred seventy-nine thousand, nine hundred ninety-seven".