4003421 has 8 divisors (see below), whose sum is σ = 4177920. Its totient is φ = 3831408.

The previous prime is 4003397. The next prime is 4003423. The reversal of 4003421 is 1243004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4003421 - 2¹⁴ = 3987037 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4003396 and 4003405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4003423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3140 + ... + 4226.

It is an arithmetic number, because the mean of its divisors is an integer number (522240).

Almost surely, 2^4003421 is an apocalyptic number.

It is an amenable number.

4003421 is a deficient number, since it is larger than the sum of its proper divisors (174499).

4003421 is a wasteful number, since it uses less digits than its factorization.

4003421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 4003421 is about 2000.8550672150. The cubic root of 4003421 is about 158.7853464601.

Adding to 4003421 its reverse (1243004), we get a palindrome (5246425).

The spelling of 4003421 in words is "four million, three thousand, four hundred twenty-one".