1278287 has 2 divisors, whose sum is σ = 1278288. Its totient is φ = 1278286.

The previous prime is 1278253. The next prime is 1278289. The reversal of 1278287 is 7828721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278287 - 2⁸ = 1278031 is a prime.

Together with 1278289, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639143 + 639144.

It is an arithmetic number, because the mean of its divisors is an integer number (639144).

2^1278287 is an apocalyptic number.

1278287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278287 is an equidigital number, since it uses as much as digits as its factorization.

1278287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12544, while the sum is 35.

The square root of 1278287 is about 1130.6135502461. The cubic root of 1278287 is about 108.5282476516.

The spelling of 1278287 in words is "one million, two hundred seventy-eight thousand, two hundred eighty-seven".