1218142 has 4 divisors (see below), whose sum is σ = 1827216. Its totient is φ = 609070.

The previous prime is 1218131. The next prime is 1218157. The reversal of 1218142 is 2418121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2418121 = 149 ⋅16229.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 304534 + ... + 304537.

It is an arithmetic number, because the mean of its divisors is an integer number (456804).

2^1218142 is an apocalyptic number.

1218142 is a deficient number, since it is larger than the sum of its proper divisors (609074).

1218142 is an equidigital number, since it uses as much as digits as its factorization.

1218142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609073.

The product of its digits is 128, while the sum is 19.

The square root of 1218142 is about 1103.6947041642. The cubic root of 1218142 is about 106.7987015137.

The spelling of 1218142 in words is "one million, two hundred eighteen thousand, one hundred forty-two".