1218842 has 4 divisors (see below), whose sum is σ = 1828266. Its totient is φ = 609420.

The previous prime is 1218829. The next prime is 1218853. The reversal of 1218842 is 2488121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 28561 = 1091^2 + 169^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304709 + ... + 304712.

2^1218842 is an apocalyptic number.

1218842 is a deficient number, since it is larger than the sum of its proper divisors (609424).

1218842 is an equidigital number, since it uses as much as digits as its factorization.

1218842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609423.

The product of its digits is 1024, while the sum is 26.

The square root of 1218842 is about 1104.0117752995. The cubic root of 1218842 is about 106.8191547328.

Subtracting from 1218842 its sum of digits (26), we obtain a square (1218816 = 1104²).

The spelling of 1218842 in words is "one million, two hundred eighteen thousand, eight hundred forty-two".