404720 has 20 divisors (see below), whose sum is σ = 941160. Its totient is φ = 161856.

The previous prime is 404713. The next prime is 404773. The reversal of 404720 is 27404.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450 + ... + 2609.

It is an arithmetic number, because the mean of its divisors is an integer number (47058).

2⁴⁰⁴⁷²⁰ is an apocalyptic number.

404720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404720 is an abundant number, since it is smaller than the sum of its proper divisors (536440).

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

404720 is a wasteful number, since it uses less digits than its factorization.

404720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5072 (or 5066 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 404720 is about 636.1760762556. The cubic root of 404720 is about 73.9693079440.

Subtracting from 404720 its product of nonzero digits (224), we obtain a square (404496 = 636²).

The spelling of 404720 in words is "four hundred four thousand, seven hundred twenty", and thus it is an iban number.