404442013 has 2 divisors, whose sum is σ = 404442014. Its totient is φ = 404442012.

The previous prime is 404441981. The next prime is 404442187. The reversal of 404442013 is 310244404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395333689 + 9108324 = 19883^2 + 3018^2 .

It is a cyclic number.

It is not a de Polignac number, because 404442013 - 2⁵ = 404441981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404448013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202221006 + 202221007.

It is an arithmetic number, because the mean of its divisors is an integer number (202221007).

Almost surely, 2^404442013 is an apocalyptic number.

It is an amenable number.

404442013 is a deficient number, since it is larger than the sum of its proper divisors (1).

404442013 is an equidigital number, since it uses as much as digits as its factorization.

404442013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 404442013 is about 20110.7437207081. The cubic root of 404442013 is about 739.5236848326.

Adding to 404442013 its reverse (310244404), we get a palindrome (714686417).

The spelling of 404442013 in words is "four hundred four million, four hundred forty-two thousand, thirteen".