408440 has 16 divisors (see below), whose sum is σ = 919080. Its totient is φ = 163360.

The previous prime is 408437. The next prime is 408461. The reversal of 408440 is 44804.

It is a Harshad number since it is a multiple of its sum of digits (20).

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 3 ways as a sum of consecutive naturals, for example, 5066 + ... + 5145.

2⁴⁰⁸⁴⁴⁰ is an apocalyptic number.

408440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

408440 is an abundant number, since it is smaller than the sum of its proper divisors (510640).

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

408440 is a wasteful number, since it uses less digits than its factorization.

408440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10222 (or 10218 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 408440 is about 639.0931074577. The cubic root of 408440 is about 74.1952477201.

It can be divided in two parts, 408 and 440, that added together give a palindrome (848).

The spelling of 408440 in words is "four hundred eight thousand, four hundred forty".