1220001 has 16 divisors (see below), whose sum is σ = 1732800. Its totient is φ = 762048.

The previous prime is 1219991. The next prime is 1220027. The reversal of 1220001 is 1000221.

It is a happy number.

1220001 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 1220001 - 2⁹ = 1219489 is a prime.

It is a Curzon number.

1220001 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220041) 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, 3030 + ... + 3408.

It is an arithmetic number, because the mean of its divisors is an integer number (108300).

2^1220001 is an apocalyptic number.

It is an amenable number.

1220001 is a deficient number, since it is larger than the sum of its proper divisors (512799).

1220001 is a wasteful number, since it uses less digits than its factorization.

1220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1220001 is about 1104.5365543974. The cubic root of 1220001 is about 106.8530022097.

Adding to 1220001 its reverse (1000221), we get a palindrome (2220222).

The spelling of 1220001 in words is "one million, two hundred twenty thousand, one".