404040440 has 32 divisors (see below), whose sum is σ = 910820160. Its totient is φ = 161308800.

The previous prime is 404040433. The next prime is 404040449. The reversal of 404040440 is 44040404.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404040449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12305 + ... + 30975.

It is an arithmetic number, because the mean of its divisors is an integer number (28463130).

Almost surely, 2^404040440 is an apocalyptic number.

404040440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404040440 is an abundant number, since it is smaller than the sum of its proper divisors (506779720).

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

404040440 is a wasteful number, since it uses less digits than its factorization.

404040440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19223 (or 19219 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 404040440 is about 20100.7571996679. The cubic root of 404040440 is about 739.2788445522.

Adding to 404040440 its reverse (44040404), we get a palindrome (448080844).

The spelling of 404040440 in words is "four hundred four million, forty thousand, four hundred forty".