404245 has 4 divisors (see below), whose sum is σ = 485100. Its totient is φ = 323392.

The previous prime is 404221. The next prime is 404249. The reversal of 404245 is 542404.

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 194481 + 209764 = 441^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 404245 - 2⁵ = 404213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40420 + ... + 40429.

It is an arithmetic number, because the mean of its divisors is an integer number (121275).

2⁴⁰⁴²⁴⁵ is an apocalyptic number.

It is an amenable number.

404245 is a deficient number, since it is larger than the sum of its proper divisors (80855).

404245 is an equidigital number, since it uses as much as digits as its factorization.

404245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80854.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 404245 is about 635.8026423349. The cubic root of 404245 is about 73.9403585668.

Adding to 404245 its reverse (542404), we get a palindrome (946649).

The spelling of 404245 in words is "four hundred four thousand, two hundred forty-five".