1278373 has 2 divisors, whose sum is σ = 1278374. Its totient is φ = 1278372.

The previous prime is 1278371. The next prime is 1278379. The reversal of 1278373 is 3738721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806404 + 471969 = 898^2 + 687^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278373 - 2¹ = 1278371 is a prime.

Together with 1278371, it forms a pair of twin primes.

It is a nialpdrome in base 6.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639186 + 639187.

It is an arithmetic number, because the mean of its divisors is an integer number (639187).

2^1278373 is an apocalyptic number.

It is an amenable number.

1278373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278373 is an equidigital number, since it uses as much as digits as its factorization.

1278373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 1278373 is about 1130.6515820535. The cubic root of 1278373 is about 108.5306814348.

The spelling of 1278373 in words is "one million, two hundred seventy-eight thousand, three hundred seventy-three".