404220666 has 16 divisors (see below), whose sum is σ = 810271584. Its totient is φ = 134435184.

The previous prime is 404220659. The next prime is 404220667. The reversal of 404220666 is 666022404.

It is not an unprimeable number, because it can be changed into a prime (404220667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73381 + ... + 78696.

It is an arithmetic number, because the mean of its divisors is an integer number (50641974).

Almost surely, 2^404220666 is an apocalyptic number.

404220666 is an abundant number, since it is smaller than the sum of its proper divisors (406050918).

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

404220666 is a wasteful number, since it uses less digits than its factorization.

404220666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152525.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 404220666 is about 20105.2397647976. The cubic root of 404220666 is about 739.3887489497.

The spelling of 404220666 in words is "four hundred four million, two hundred twenty thousand, six hundred sixty-six".