443909421 has 6 divisors (see below), whose sum is σ = 641202510. Its totient is φ = 295939608.

The previous prime is 443909399. The next prime is 443909437. The reversal of 443909421 is 124909344.

It can be written as a sum of positive squares in only one way, i.e., 355737321 + 88172100 = 18861^2 + 9390^2 .

It is not a de Polignac number, because 443909421 - 2¹⁰ = 443908397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443909441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24661626 + ... + 24661643.

It is an arithmetic number, because the mean of its divisors is an integer number (106867085).

Almost surely, 2^443909421 is an apocalyptic number.

It is an amenable number.

443909421 is a deficient number, since it is larger than the sum of its proper divisors (197293089).

443909421 is a wasteful number, since it uses less digits than its factorization.

443909421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49323275 (or 49323272 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 443909421 is about 21069.1580515217. The cubic root of 443909421 is about 762.8364809302.

The spelling of 443909421 in words is "four hundred forty-three million, nine hundred nine thousand, four hundred twenty-one".