405550404 has 144 divisors (see below), whose sum is σ = 1212277248. Its totient is φ = 111919104.

The previous prime is 405550403. The next prime is 405550417. The reversal of 405550404 is 404055504.

It is a super-2 number, since 2×405550404² = 328942260369126432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (405550403) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1148692 + ... + 1149044.

It is an arithmetic number, because the mean of its divisors is an integer number (8418592).

Almost surely, 2^405550404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405550404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606138624).

405550404 is an abundant number, since it is smaller than the sum of its proper divisors (806726844).

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

405550404 is a wasteful number, since it uses less digits than its factorization.

405550404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 405550404 is about 20138.2820518534. The cubic root of 405550404 is about 740.1986342834.

The spelling of 405550404 in words is "four hundred five million, five hundred fifty thousand, four hundred four".