448657921 has 4 divisors (see below), whose sum is σ = 448701700. Its totient is φ = 448614144.

The previous prime is 448657907. The next prime is 448657933. The reversal of 448657921 is 129756844.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 66650896 + 382007025 = 8164^2 + 19545^2 .

It is a cyclic number.

It is not a de Polignac number, because 448657921 - 2²¹ = 446560769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (448657981) 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, 2665 + ... + 30073.

It is an arithmetic number, because the mean of its divisors is an integer number (112175425).

Almost surely, 2^448657921 is an apocalyptic number.

It is an amenable number.

448657921 is a deficient number, since it is larger than the sum of its proper divisors (43779).

448657921 is a wasteful number, since it uses less digits than its factorization.

448657921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43778.

The product of its digits is 483840, while the sum is 46.

The square root of 448657921 is about 21181.5467093411. The cubic root of 448657921 is about 765.5468606102.

The spelling of 448657921 in words is "four hundred forty-eight million, six hundred fifty-seven thousand, nine hundred twenty-one".