404055521 has 8 divisors (see below), whose sum is σ = 424842600. Its totient is φ = 383725440.

The previous prime is 404055499. The next prime is 404055523. The reversal of 404055521 is 125550404.

It can be written as a sum of positive squares in 4 ways, for example, as 44422225 + 359633296 = 6665^2 + 18964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404055521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404055523) 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, 112436 + ... + 115973.

It is an arithmetic number, because the mean of its divisors is an integer number (53105325).

Almost surely, 2^404055521 is an apocalyptic number.

It is an amenable number.

404055521 is a deficient number, since it is larger than the sum of its proper divisors (20787079).

404055521 is a wasteful number, since it uses less digits than its factorization.

404055521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228499.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 404055521 is about 20101.1323312892. The cubic root of 404055521 is about 739.2880424150.

The spelling of 404055521 in words is "four hundred four million, fifty-five thousand, five hundred twenty-one".