1220813 has 16 divisors (see below), whose sum is σ = 1425600. Its totient is φ = 1034880.

The previous prime is 1220803. The next prime is 1220819. The reversal of 1220813 is 3180221.

It is not a de Polignac number, because 1220813 - 2⁴ = 1220797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220791 and 1220800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220819) 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, 13673 + ... + 13761.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2^1220813 is an apocalyptic number.

It is an amenable number.

1220813 is a deficient number, since it is larger than the sum of its proper divisors (204787).

1220813 is a wasteful number, since it uses less digits than its factorization.

1220813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1220813 is about 1104.9040682340. The cubic root of 1220813 is about 106.8767031180.

It can be divided in two parts, 12208 and 13, that added together give a palindrome (12221).

The spelling of 1220813 in words is "one million, two hundred twenty thousand, eight hundred thirteen".