448217921 has 4 divisors (see below), whose sum is σ = 448478292. Its totient is φ = 447957552.

The previous prime is 448217911. The next prime is 448218049. The reversal of 448217921 is 129712844.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 337126321 + 111091600 = 18361^2 + 10540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-448217921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (448217911) 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, 127586 + ... + 131051.

It is an arithmetic number, because the mean of its divisors is an integer number (112119573).

Almost surely, 2^448217921 is an apocalyptic number.

It is an amenable number.

448217921 is a deficient number, since it is larger than the sum of its proper divisors (260371).

448217921 is a wasteful number, since it uses less digits than its factorization.

448217921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260370.

The product of its digits is 32256, while the sum is 38.

The square root of 448217921 is about 21171.1577623898. The cubic root of 448217921 is about 765.2965208179.

The spelling of 448217921 in words is "four hundred forty-eight million, two hundred seventeen thousand, nine hundred twenty-one".