447972721 has 8 divisors (see below), whose sum is σ = 513138560. Its totient is φ = 383099328.

The previous prime is 447972697. The next prime is 447972731. The reversal of 447972721 is 127279744.

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

It is a cyclic number.

It is not a de Polignac number, because 447972721 - 2¹¹ = 447970673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (447972731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69816 + ... + 75961.

It is an arithmetic number, because the mean of its divisors is an integer number (64142320).

Almost surely, 2^447972721 is an apocalyptic number.

It is an amenable number.

447972721 is a deficient number, since it is larger than the sum of its proper divisors (65165839).

447972721 is a wasteful number, since it uses less digits than its factorization.

447972721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146223.

The product of its digits is 197568, while the sum is 43.

The square root of 447972721 is about 21165.3660729032. The cubic root of 447972721 is about 765.1569421837.

The spelling of 447972721 in words is "four hundred forty-seven million, nine hundred seventy-two thousand, seven hundred twenty-one".