404406 has 16 divisors (see below), whose sum is σ = 898800. Its totient is φ = 134784.

The previous prime is 404399. The next prime is 404419. The reversal of 404406 is 604404.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3691 + ... + 3798.

It is an arithmetic number, because the mean of its divisors is an integer number (56175).

2⁴⁰⁴⁴⁰⁶ is an apocalyptic number.

404406 is an abundant number, since it is smaller than the sum of its proper divisors (494394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404406 is a wasteful number, since it uses less digits than its factorization.

404406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7500 (or 7494 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 404406 is about 635.9292413469. The cubic root of 404406 is about 73.9501734214.

The spelling of 404406 in words is "four hundred four thousand, four hundred six".