1278022 has 4 divisors (see below), whose sum is σ = 1917036. Its totient is φ = 639010.

The previous prime is 1278007. The next prime is 1278029. The reversal of 1278022 is 2208721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2208721 = 353 ⋅6257.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1277984 and 1278002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278029) 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, 319504 + ... + 319507.

It is an arithmetic number, because the mean of its divisors is an integer number (479259).

2^1278022 is an apocalyptic number.

1278022 is a deficient number, since it is larger than the sum of its proper divisors (639014).

1278022 is an equidigital number, since it uses as much as digits as its factorization.

1278022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639013.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 1278022 is about 1130.4963511662. The cubic root of 1278022 is about 108.5207475172.

The spelling of 1278022 in words is "one million, two hundred seventy-eight thousand, twenty-two".