1118220 has 24 divisors (see below), whose sum is σ = 3131184. Its totient is φ = 298176.

The previous prime is 1118219. The next prime is 1118261. The reversal of 1118220 is 228111.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1118220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9259 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (130466).

2^1118220 is an apocalyptic number.

1118220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1118220 is an abundant number, since it is smaller than the sum of its proper divisors (2012964).

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

1118220 is a wasteful number, since it uses less digits than its factorization.

1118220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18649 (or 18647 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1118220 is about 1057.4592190718. The cubic root of 1118220 is about 103.7948371547.

The spelling of 1118220 in words is "one million, one hundred eighteen thousand, two hundred twenty".