1278467 has 2 divisors, whose sum is σ = 1278468. Its totient is φ = 1278466.

The previous prime is 1278463. The next prime is 1278479. The reversal of 1278467 is 7648721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1278467 - 2² = 1278463 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 2¹⁵ + 7² + 8⁵ + 4¹⁰ + 6⁶ + 7⁶ .

It is not a weakly prime, because it can be changed into another prime (1278463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639233 + 639234.

It is an arithmetic number, because the mean of its divisors is an integer number (639234).

2^1278467 is an apocalyptic number.

1278467 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278467 is an equidigital number, since it uses as much as digits as its factorization.

1278467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 35.

The square root of 1278467 is about 1130.6931502402. The cubic root of 1278467 is about 108.5333414915.

The spelling of 1278467 in words is "one million, two hundred seventy-eight thousand, four hundred sixty-seven".