1220413 has 4 divisors (see below), whose sum is σ = 1292220. Its totient is φ = 1148608.

The previous prime is 1220411. The next prime is 1220423. The reversal of 1220413 is 3140221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 727609 + 492804 = 853^2 + 702^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220413 - 2¹ = 1220411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220393 and 1220402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35878 + ... + 35911.

It is an arithmetic number, because the mean of its divisors is an integer number (323055).

2^1220413 is an apocalyptic number.

It is an amenable number.

1220413 is a deficient number, since it is larger than the sum of its proper divisors (71807).

1220413 is an equidigital number, since it uses as much as digits as its factorization.

1220413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71806.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1220413 is about 1104.7230422147. The cubic root of 1220413 is about 106.8650291075.

Adding to 1220413 its reverse (3140221), we get a palindrome (4360634).

The spelling of 1220413 in words is "one million, two hundred twenty thousand, four hundred thirteen".