405404420 has 24 divisors (see below), whose sum is σ = 867414744. Its totient is φ = 159101696.

The previous prime is 405404401. The next prime is 405404429. The reversal of 405404420 is 24404504.

It can be written as a sum of positive squares in 4 ways, for example, as 12334144 + 393070276 = 3512^2 + 19826^2 .

It is not an unprimeable number, because it can be changed into a prime (405404429) 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, 190169 + ... + 192288.

It is an arithmetic number, because the mean of its divisors is an integer number (36142281).

Almost surely, 2^405404420 is an apocalyptic number.

It is an amenable number.

405404420 is an abundant number, since it is smaller than the sum of its proper divisors (462010324).

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

405404420 is a wasteful number, since it uses less digits than its factorization.

405404420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382519 (or 382517 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 405404420 is about 20134.6571860561. The cubic root of 405404420 is about 740.1098083943.

Adding to 405404420 its reverse (24404504), we get a palindrome (429808924).

The spelling of 405404420 in words is "four hundred five million, four hundred four thousand, four hundred twenty".