1220166 has 24 divisors (see below), whose sum is σ = 2695680. Its totient is φ = 398736.

The previous prime is 1220147. The next prime is 1220171. The reversal of 1220166 is 6610221.

It is a happy number.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 315 + ... + 1593.

It is an arithmetic number, because the mean of its divisors is an integer number (112320).

2^1220166 is an apocalyptic number.

1220166 is an abundant number, since it is smaller than the sum of its proper divisors (1475514).

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

1220166 is a wasteful number, since it uses less digits than its factorization.

1220166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340 (or 1337 counting only the distinct ones).

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

The square root of 1220166 is about 1104.6112438320. The cubic root of 1220166 is about 106.8578191321.

Adding to 1220166 its reverse (6610221), we get a palindrome (7830387).

The spelling of 1220166 in words is "one million, two hundred twenty thousand, one hundred sixty-six".