1278371 has 2 divisors, whose sum is σ = 1278372. Its totient is φ = 1278370.

The previous prime is 1278341. The next prime is 1278373. The reversal of 1278371 is 1738721.

1278371 is nontrivially palindromic in base 9.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278371 - 2¹⁸ = 1016227 is a prime.

Together with 1278373, 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 (1278373) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639185 + 639186.

It is an arithmetic number, because the mean of its divisors is an integer number (639186).

2^1278371 is an apocalyptic number.

1278371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278371 is an equidigital number, since it uses as much as digits as its factorization.

1278371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 29.

The square root of 1278371 is about 1130.6506976074. The cubic root of 1278371 is about 108.5306248364.

The spelling of 1278371 in words is "one million, two hundred seventy-eight thousand, three hundred seventy-one".