406044 has 18 divisors (see below), whose sum is σ = 1026480. Its totient is φ = 135336.

The previous prime is 406037. The next prime is 406067. The reversal of 406044 is 440604.

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a congruent number.

It is an unprimeable number.

406044 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5604 + ... + 5675.

2⁴⁰⁶⁰⁴⁴ is an apocalyptic number.

It is an amenable number.

406044 is an abundant number, since it is smaller than the sum of its proper divisors (620436).

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

406044 is a wasteful number, since it uses less digits than its factorization.

406044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11289 (or 11284 counting only the distinct ones).

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

The square root of 406044 is about 637.2158190127. The cubic root of 406044 is about 74.0498811487.

Adding to 406044 its reverse (440604), we get a palindrome (846648).

It can be divided in two parts, 40 and 6044, that added together give a square (6084 = 78²).

The spelling of 406044 in words is "four hundred six thousand, forty-four".