404945 has 4 divisors (see below), whose sum is σ = 485940. Its totient is φ = 323952.

The previous prime is 404941. The next prime is 404951. The reversal of 404945 is 549404.

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 287296 + 117649 = 536^2 + 343^2 .

It is a cyclic number.

It is not a de Polignac number, because 404945 - 2² = 404941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (404941) 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, 40490 + ... + 40499.

It is an arithmetic number, because the mean of its divisors is an integer number (121485).

2⁴⁰⁴⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

404945 is a deficient number, since it is larger than the sum of its proper divisors (80995).

404945 is an equidigital number, since it uses as much as digits as its factorization.

404945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80994.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 404945 is about 636.3528895196. The cubic root of 404945 is about 73.9830129014.

The spelling of 404945 in words is "four hundred four thousand, nine hundred forty-five".