1218778 has 8 divisors (see below), whose sum is σ = 1994400. Its totient is φ = 553980.

The previous prime is 1218773. The next prime is 1218779. The reversal of 1218778 is 8778121.

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 (1218773) 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, 27678 + ... + 27721.

It is an arithmetic number, because the mean of its divisors is an integer number (249300).

2^1218778 is an apocalyptic number.

1218778 is a deficient number, since it is larger than the sum of its proper divisors (775622).

1218778 is a wasteful number, since it uses less digits than its factorization.

1218778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55412.

The product of its digits is 6272, while the sum is 34.

The square root of 1218778 is about 1103.9827897209. The cubic root of 1218778 is about 106.8172850495.

The spelling of 1218778 in words is "one million, two hundred eighteen thousand, seven hundred seventy-eight".