447138238 has 4 divisors (see below), whose sum is σ = 670707360. Its totient is φ = 223569118.

The previous prime is 447138221. The next prime is 447138259. The reversal of 447138238 is 832831744.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 447138238.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 111784558 + ... + 111784561.

It is an arithmetic number, because the mean of its divisors is an integer number (167676840).

Almost surely, 2^447138238 is an apocalyptic number.

447138238 is a deficient number, since it is larger than the sum of its proper divisors (223569122).

447138238 is a wasteful number, since it uses less digits than its factorization.

447138238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223569121.

The product of its digits is 129024, while the sum is 40.

The square root of 447138238 is about 21145.6434756666. The cubic root of 447138238 is about 764.6815357481.

The spelling of 447138238 in words is "four hundred forty-seven million, one hundred thirty-eight thousand, two hundred thirty-eight".