1218671 has 4 divisors (see below), whose sum is σ = 1227000. Its totient is φ = 1210344.

The previous prime is 1218653. The next prime is 1218683. The reversal of 1218671 is 1768121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1768121 = 19 ⋅93059.

It is a cyclic number.

It is not a de Polignac number, because 1218671 - 2¹⁰ = 1217647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218601) 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, 3941 + ... + 4238.

It is an arithmetic number, because the mean of its divisors is an integer number (306750).

2^1218671 is an apocalyptic number.

1218671 is a deficient number, since it is larger than the sum of its proper divisors (8329).

1218671 is an equidigital number, since it uses as much as digits as its factorization.

1218671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8328.

The product of its digits is 672, while the sum is 26.

The square root of 1218671 is about 1103.9343277569. The cubic root of 1218671 is about 106.8141590265.

The spelling of 1218671 in words is "one million, two hundred eighteen thousand, six hundred seventy-one".