443700421 has 4 divisors (see below), whose sum is σ = 444174892. Its totient is φ = 443225952.

The previous prime is 443700403. The next prime is 443700443. The reversal of 443700421 is 124007344.

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 14630625 + 429069796 = 3825^2 + 20714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-443700421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443700461) 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, 235830 + ... + 237703.

It is an arithmetic number, because the mean of its divisors is an integer number (111043723).

Almost surely, 2^443700421 is an apocalyptic number.

It is an amenable number.

443700421 is a deficient number, since it is larger than the sum of its proper divisors (474471).

443700421 is an equidigital number, since it uses as much as digits as its factorization.

443700421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474470.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 443700421 is about 21064.1976111126. The cubic root of 443700421 is about 762.7167434006.

Adding to 443700421 its reverse (124007344), we get a palindrome (567707765).

The spelling of 443700421 in words is "four hundred forty-three million, seven hundred thousand, four hundred twenty-one".