440406 has 24 divisors (see below), whose sum is σ = 978120. Its totient is φ = 143136.

The previous prime is 440399. The next prime is 440431. The reversal of 440406 is 604044.

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

It is a Curzon number.

It is a nialpdrome in base 9.

It is a congruent number.

It is an unprimeable number.

440406 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 11 ways as a sum of consecutive naturals, for example, 490 + ... + 1058.

It is an arithmetic number, because the mean of its divisors is an integer number (40755).

2⁴⁴⁰⁴⁰⁶ is an apocalyptic number.

440406 is an abundant number, since it is smaller than the sum of its proper divisors (537714).

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

440406 is a wasteful number, since it uses less digits than its factorization.

440406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 617 counting only the distinct ones).

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

The square root of 440406 is about 663.6309215219. The cubic root of 440406 is about 76.0824359432.

The spelling of 440406 in words is "four hundred forty thousand, four hundred six".