405666500 has 96 divisors (see below), whose sum is σ = 928942560. Its totient is φ = 154560000.

The previous prime is 405666449. The next prime is 405666509. The reversal of 405666500 is 5666504.

It can be written as a sum of positive squares in 16 ways, for example, as 237653056 + 168013444 = 15416^2 + 12962^2 .

It is not an unprimeable number, because it can be changed into a prime (405666509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1464362 + ... + 1464638.

It is an arithmetic number, because the mean of its divisors is an integer number (9676485).

Almost surely, 2^405666500 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 405666500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464471280).

405666500 is an abundant number, since it is smaller than the sum of its proper divisors (523276060).

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

405666500 is a wasteful number, since it uses less digits than its factorization.

405666500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 405666500 is about 20141.1643158979. The cubic root of 405666500 is about 740.2692592095.

The spelling of 405666500 in words is "four hundred five million, six hundred sixty-six thousand, five hundred".