1166220 has 144 divisors (see below), whose sum is σ = 4193280. Its totient is φ = 259200.

The previous prime is 1166219. The next prime is 1166227. The reversal of 1166220 is 226611.

It is a happy number.

1166220 is a `hidden beast` number, since 1 + 1 + 662 + 2 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1166193 and 1166202.

It is not an unprimeable number, because it can be changed into a prime (1166227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37605 + ... + 37635.

It is an arithmetic number, because the mean of its divisors is an integer number (29120).

2^1166220 is an apocalyptic number.

1166220 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 1166220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2096640).

1166220 is an abundant number, since it is smaller than the sum of its proper divisors (3027060).

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

1166220 is a wasteful number, since it uses less digits than its factorization.

1166220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1166220 is about 1079.9166634514. The cubic root of 1166220 is about 105.2592234494.

Multiplying 1166220 by its sum of digits (18), we get a triangular number (20991960 = T₆₄₇₉).

It can be divided in two parts, 116 and 6220, that added together give a palindrome (6336).

The spelling of 1166220 in words is "one million, one hundred sixty-six thousand, two hundred twenty".