1218628 has 12 divisors (see below), whose sum is σ = 2258172. Its totient is φ = 573440.

The previous prime is 1218617. The next prime is 1218631. The reversal of 1218628 is 8268121.

It can be written as a sum of positive squares in 2 ways, for example, as 386884 + 831744 = 622^2 + 912^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1218596 and 1218605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8893 + ... + 9028.

It is an arithmetic number, because the mean of its divisors is an integer number (188181).

2^1218628 is an apocalyptic number.

It is an amenable number.

1218628 is a deficient number, since it is larger than the sum of its proper divisors (1039544).

1218628 is a wasteful number, since it uses less digits than its factorization.

1218628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17942 (or 17940 counting only the distinct ones).

The product of its digits is 1536, while the sum is 28.

The square root of 1218628 is about 1103.9148517889. The cubic root of 1218628 is about 106.8129027228.

The spelling of 1218628 in words is "one million, two hundred eighteen thousand, six hundred twenty-eight".