1231218 has 24 divisors (see below), whose sum is σ = 2707068. Its totient is φ = 404352.

The previous prime is 1231207. The next prime is 1231229. The reversal of 1231218 is 8121321.

It is an interprime number because it is at equal distance from previous prime (1231207) and next prime (1231229).

It can be written as a sum of positive squares in 2 ways, for example, as 1159929 + 71289 = 1077^2 + 267^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1231218.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 846 + ... + 1782.

2^1231218 is an apocalyptic number.

1231218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1231218 is an abundant number, since it is smaller than the sum of its proper divisors (1475850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231218 is a wasteful number, since it uses less digits than its factorization.

1231218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 1015 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1231218 is about 1109.6026315758. The cubic root of 1231218 is about 107.1794815746.

Adding to 1231218 its reverse (8121321), we get a palindrome (9352539).

The spelling of 1231218 in words is "one million, two hundred thirty-one thousand, two hundred eighteen".