404990 has 8 divisors (see below), whose sum is σ = 729000. Its totient is φ = 161992.

The previous prime is 404983. The next prime is 405001. The reversal of 404990 is 99404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 20240 + ... + 20259.

It is an arithmetic number, because the mean of its divisors is an integer number (91125).

2⁴⁰⁴⁹⁹⁰ is an apocalyptic number.

404990 is a deficient number, since it is larger than the sum of its proper divisors (324010).

404990 is a wasteful number, since it uses less digits than its factorization.

404990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40506.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 404990 is about 636.3882462774. The cubic root of 404990 is about 73.9857532836.

The spelling of 404990 in words is "four hundred four thousand, nine hundred ninety".