404021064 has 32 divisors (see below), whose sum is σ = 1011899520. Its totient is φ = 134427456.

The previous prime is 404021041. The next prime is 404021081. The reversal of 404021064 is 460120404.

It is a self number, because there is not a number n which added to its sum of digits gives 404021064.

It is an unprimeable number.

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, 1744 + ... + 28479.

It is an arithmetic number, because the mean of its divisors is an integer number (31621860).

Almost surely, 2^404021064 is an apocalyptic number.

It is an amenable number.

404021064 is an abundant number, since it is smaller than the sum of its proper divisors (607878456).

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

404021064 is a wasteful number, since it uses less digits than its factorization.

404021064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30789 (or 30785 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 404021064 is about 20100.2752219963. The cubic root of 404021064 is about 739.2670268442.

Adding to 404021064 its reverse (460120404), we get a palindrome (864141468).

The spelling of 404021064 in words is "four hundred four million, twenty-one thousand, sixty-four".