1279457 has 2 divisors, whose sum is σ = 1279458. Its totient is φ = 1279456.

The previous prime is 1279427. The next prime is 1279459. The reversal of 1279457 is 7549721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1008016 + 271441 = 1004^2 + 521^2 .

It is an emirp because it is prime and its reverse (7549721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279457 - 2¹² = 1275361 is a prime.

Together with 1279459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1279459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639728 + 639729.

It is an arithmetic number, because the mean of its divisors is an integer number (639729).

2^1279457 is an apocalyptic number.

It is an amenable number.

1279457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279457 is an equidigital number, since it uses as much as digits as its factorization.

1279457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 35.

The square root of 1279457 is about 1131.1308500788. The cubic root of 1279457 is about 108.5613490676.

The spelling of 1279457 in words is "one million, two hundred seventy-nine thousand, four hundred fifty-seven".