405147666 has 64 divisors (see below), whose sum is σ = 1013124096. Its totient is φ = 104932800.

The previous prime is 405147637. The next prime is 405147667. The reversal of 405147666 is 666741504.

It is not an unprimeable number, because it can be changed into a prime (405147667) 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, 193461 + ... + 195543.

It is an arithmetic number, because the mean of its divisors is an integer number (15830064).

Almost surely, 2^405147666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405147666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (506562048).

405147666 is an abundant number, since it is smaller than the sum of its proper divisors (607976430).

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

405147666 is a wasteful number, since it uses less digits than its factorization.

405147666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 405147666 is about 20128.2802544082. The cubic root of 405147666 is about 739.9535312919.

The spelling of 405147666 in words is "four hundred five million, one hundred forty-seven thousand, six hundred sixty-six".