1220205 has 16 divisors (see below), whose sum is σ = 2231424. Its totient is φ = 557760.

The previous prime is 1220203. The next prime is 1220239. The reversal of 1220205 is 5020221.

It is not a de Polignac number, because 1220205 - 2¹ = 1220203 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5706 + ... + 5915.

It is an arithmetic number, because the mean of its divisors is an integer number (139464).

2^1220205 is an apocalyptic number.

1220205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220205 is a deficient number, since it is larger than the sum of its proper divisors (1011219).

1220205 is a wasteful number, since it uses less digits than its factorization.

1220205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11636.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 1220205 is about 1104.6288969604. The cubic root of 1220205 is about 106.8589576140.

Adding to 1220205 its reverse (5020221), we get a palindrome (6240426).

The spelling of 1220205 in words is "one million, two hundred twenty thousand, two hundred five".