447921818 has 8 divisors (see below), whose sum is σ = 681346080. Its totient is φ = 220806460.

The previous prime is 447921809. The next prime is 447921823. The reversal of 447921818 is 818129744.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1577048 + ... + 1577331.

It is an arithmetic number, because the mean of its divisors is an integer number (85168260).

Almost surely, 2^447921818 is an apocalyptic number.

447921818 is a deficient number, since it is larger than the sum of its proper divisors (233424262).

447921818 is a wasteful number, since it uses less digits than its factorization.

447921818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154452.

The product of its digits is 129024, while the sum is 44.

The square root of 447921818 is about 21164.1635317817. The cubic root of 447921818 is about 765.1279595713.

The spelling of 447921818 in words is "four hundred forty-seven million, nine hundred twenty-one thousand, eight hundred eighteen".