9403421 has 4 divisors (see below), whose sum is σ = 9410844. Its totient is φ = 9396000.

The previous prime is 9403411. The next prime is 9403451. The reversal of 9403421 is 1243049.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1243049 = 269 ⋅4621.

It can be written as a sum of positive squares in 2 ways, for example, as 8491396 + 912025 = 2914^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 9403421 - 2⁶ = 9403357 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 (9403411) 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, 1280 + ... + 4521.

It is an arithmetic number, because the mean of its divisors is an integer number (2352711).

Almost surely, 2^9403421 is an apocalyptic number.

It is an amenable number.

9403421 is a deficient number, since it is larger than the sum of its proper divisors (7423).

9403421 is a wasteful number, since it uses less digits than its factorization.

9403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7422.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 9403421 is about 3066.4997961846. The cubic root of 9403421 is about 211.0710286989.

The spelling of 9403421 in words is "nine million, four hundred three thousand, four hundred twenty-one".