404000001 has 16 divisors (see below), whose sum is σ = 599278720. Its totient is φ = 268991280.

The previous prime is 403999993. The next prime is 404000033. The reversal of 404000001 is 100000404.

It is not a de Polignac number, because 404000001 - 2³ = 403999993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (404005001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13131 + ... + 31311.

It is an arithmetic number, because the mean of its divisors is an integer number (37454920).

Almost surely, 2^404000001 is an apocalyptic number.

It is an amenable number.

404000001 is a deficient number, since it is larger than the sum of its proper divisors (195278719).

404000001 is a wasteful number, since it uses less digits than its factorization.

404000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19013 (or 19007 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 404000001 is about 20099.7512671177. The cubic root of 404000001 is about 739.2541797813.

Adding to 404000001 its reverse (100000404), we get a palindrome (504000405).

The spelling of 404000001 in words is "four hundred four million, one", and thus it is an aban number.