9943421 has 4 divisors (see below), whose sum is σ = 9955932. Its totient is φ = 9930912.

The previous prime is 9943411. The next prime is 9943457. The reversal of 9943421 is 1243499.

It is a happy number.

9943421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 3496900 + 6446521 = 1870^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 9943421 - 2⁶ = 9943357 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9943411) 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, 4976 + ... + 6681.

It is an arithmetic number, because the mean of its divisors is an integer number (2488983).

Almost surely, 2^9943421 is an apocalyptic number.

It is an amenable number.

9943421 is a deficient number, since it is larger than the sum of its proper divisors (12511).

9943421 is a wasteful number, since it uses less digits than its factorization.

9943421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12510.

The product of its digits is 7776, while the sum is 32.

The square root of 9943421 is about 3153.3190450698. The cubic root of 9943421 is about 215.0363810798.

The spelling of 9943421 in words is "nine million, nine hundred forty-three thousand, four hundred twenty-one".