447668421 has 4 divisors (see below), whose sum is σ = 596891232. Its totient is φ = 298445612.

The previous prime is 447668413. The next prime is 447668437. The reversal of 447668421 is 124866744.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 447668421 - 2³ = 447668413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (447668471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74611401 + ... + 74611406.

It is an arithmetic number, because the mean of its divisors is an integer number (149222808).

Almost surely, 2^447668421 is an apocalyptic number.

It is an amenable number.

447668421 is a deficient number, since it is larger than the sum of its proper divisors (149222811).

447668421 is a wasteful number, since it uses less digits than its factorization.

447668421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149222810.

The product of its digits is 258048, while the sum is 42.

The square root of 447668421 is about 21158.1762210262. The cubic root of 447668421 is about 764.9836503832.

The spelling of 447668421 in words is "four hundred forty-seven million, six hundred sixty-eight thousand, four hundred twenty-one".