1218220 has 24 divisors (see below), whose sum is σ = 2709504. Its totient is φ = 458496.

The previous prime is 1218211. The next prime is 1218221. The reversal of 1218220 is 228121.

It is a junction number, because it is equal to n+sod(n) for n = 1218194 and 1218203.

It is not an unprimeable number, because it can be changed into a prime (1218221) 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, 1452 + ... + 2131.

It is an arithmetic number, because the mean of its divisors is an integer number (112896).

2^1218220 is an apocalyptic number.

1218220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218220 is an abundant number, since it is smaller than the sum of its proper divisors (1491284).

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

1218220 is a wasteful number, since it uses less digits than its factorization.

1218220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609 (or 3607 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1218220 is about 1103.7300394571. The cubic root of 1218220 is about 106.8009809745.

Subtracting from 1218220 its reverse (228121), we obtain a palindrome (990099).

The spelling of 1218220 in words is "one million, two hundred eighteen thousand, two hundred twenty".