405666404 has 48 divisors (see below), whose sum is σ = 837424896. Its totient is φ = 169516800.

The previous prime is 405666367. The next prime is 405666407. The reversal of 405666404 is 404666504.

It is not an unprimeable number, because it can be changed into a prime (405666407) 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, 153704 + ... + 156320.

It is an arithmetic number, because the mean of its divisors is an integer number (17446352).

Almost surely, 2^405666404 is an apocalyptic number.

405666404 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

405666404 is an abundant number, since it is smaller than the sum of its proper divisors (431758492).

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

405666404 is a wasteful number, since it uses less digits than its factorization.

405666404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2916 (or 2914 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 405666404 is about 20141.1619327188. The cubic root of 405666404 is about 740.2692008152.

The spelling of 405666404 in words is "four hundred five million, six hundred sixty-six thousand, four hundred four".