1218394 has 8 divisors (see below), whose sum is σ = 1923840. Its totient is φ = 577116.

The previous prime is 1218391. The next prime is 1218401. The reversal of 1218394 is 4938121.

It is a happy number.

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 (1218391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15994 + ... + 16069.

It is an arithmetic number, because the mean of its divisors is an integer number (240480).

2^1218394 is an apocalyptic number.

1218394 is a deficient number, since it is larger than the sum of its proper divisors (705446).

1218394 is a wasteful number, since it uses less digits than its factorization.

1218394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32084.

The product of its digits is 1728, while the sum is 28.

The square root of 1218394 is about 1103.8088602652. The cubic root of 1218394 is about 106.8060655750.

It can be divided in two parts, 121 and 8394, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 1218394 in words is "one million, two hundred eighteen thousand, three hundred ninety-four".