1188220 has 36 divisors (see below), whose sum is σ = 2748312. Its totient is φ = 431200.

The previous prime is 1188197. The next prime is 1188223. The reversal of 1188220 is 228811.

1188220 = T₄₃₉ + T₄₄₀ + ... + T₄₅₀.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1188191 and 1188200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2175 + ... + 2665.

It is an arithmetic number, because the mean of its divisors is an integer number (76342).

2^1188220 is an apocalyptic number.

1188220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1188220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374156).

1188220 is an abundant number, since it is smaller than the sum of its proper divisors (1560092).

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

1188220 is a wasteful number, since it uses less digits than its factorization.

1188220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1188220 is about 1090.0550444817. The cubic root of 1188220 is about 105.9169873384.

It can be divided in two parts, 118 and 8220, that added together give a palindrome (8338).

The spelling of 1188220 in words is "one million, one hundred eighty-eight thousand, two hundred twenty".