1218218 has 16 divisors (see below), whose sum is σ = 1938816. Its totient is φ = 572880.

The previous prime is 1218211. The next prime is 1218221. The reversal of 1218218 is 8128121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 1218193 and 1218202.

It is not an unprimeable number, because it can be changed into a prime (1218211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3080 + ... + 3452.

It is an arithmetic number, because the mean of its divisors is an integer number (121176).

2^1218218 is an apocalyptic number.

1218218 is a deficient number, since it is larger than the sum of its proper divisors (720598).

1218218 is a wasteful number, since it uses less digits than its factorization.

1218218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469.

The product of its digits is 256, while the sum is 23.

The square root of 1218218 is about 1103.7291334381. The cubic root of 1218218 is about 106.8009225280.

Subtracting 1218218 from its reverse (8128121), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1218218 in words is "one million, two hundred eighteen thousand, two hundred eighteen".