1278818 has 8 divisors (see below), whose sum is σ = 1928748. Its totient is φ = 635904.

The previous prime is 1278817. The next prime is 1278839. The reversal of 1278818 is 8188721.

It can be written as a sum of positive squares in 2 ways, for example, as 1261129 + 17689 = 1123^2 + 133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1278811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1271 + ... + 2042.

2^1278818 is an apocalyptic number.

1278818 is a deficient number, since it is larger than the sum of its proper divisors (649930).

1278818 is a wasteful number, since it uses less digits than its factorization.

1278818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508.

The product of its digits is 7168, while the sum is 35.

The square root of 1278818 is about 1130.8483541130. The cubic root of 1278818 is about 108.5432731041.

Subtracting 1278818 from its reverse (8188721), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1278818 in words is "one million, two hundred seventy-eight thousand, eight hundred eighteen".