447128393 has 4 divisors (see below), whose sum is σ = 453426048. Its totient is φ = 440830740.

The previous prime is 447128377. The next prime is 447128401. The reversal of 447128393 is 393821744.

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 447128393 - 2⁴ = 447128377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 447128393.

It is not an unprimeable number, because it can be changed into a prime (447128323) 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, 3148721 + ... + 3148862.

It is an arithmetic number, because the mean of its divisors is an integer number (113356512).

Almost surely, 2^447128393 is an apocalyptic number.

It is an amenable number.

447128393 is a deficient number, since it is larger than the sum of its proper divisors (6297655).

447128393 is an equidigital number, since it uses as much as digits as its factorization.

447128393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6297654.

The product of its digits is 145152, while the sum is 41.

The square root of 447128393 is about 21145.4106841177. The cubic root of 447128393 is about 764.6759235054.

The spelling of 447128393 in words is "four hundred forty-seven million, one hundred twenty-eight thousand, three hundred ninety-three".