1220841 has 6 divisors (see below), whose sum is σ = 1763450. Its totient is φ = 813888.

The previous prime is 1220839. The next prime is 1220893. The reversal of 1220841 is 1480221.

It can be written as a sum of positive squares in only one way, i.e., 1218816 + 2025 = 1104^2 + 45^2 .

It is not a de Polignac number, because 1220841 - 2¹ = 1220839 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67816 + ... + 67833.

2^1220841 is an apocalyptic number.

It is an amenable number.

1220841 is a deficient number, since it is larger than the sum of its proper divisors (542609).

1220841 is a wasteful number, since it uses less digits than its factorization.

1220841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135655 (or 135652 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1220841 is about 1104.9167389446. The cubic root of 1220841 is about 106.8775202032.

The spelling of 1220841 in words is "one million, two hundred twenty thousand, eight hundred forty-one".