4089421 has 4 divisors (see below), whose sum is σ = 4673632. Its totient is φ = 3505212.

The previous prime is 4089413. The next prime is 4089431. The reversal of 4089421 is 1249804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4089421 - 2³ = 4089413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4089421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4089431) 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 3 ways as a sum of consecutive naturals, for example, 292095 + ... + 292108.

It is an arithmetic number, because the mean of its divisors is an integer number (1168408).

Almost surely, 2^4089421 is an apocalyptic number.

It is an amenable number.

4089421 is a deficient number, since it is larger than the sum of its proper divisors (584211).

4089421 is an equidigital number, since it uses as much as digits as its factorization.

4089421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584210.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 4089421 is about 2022.2316880120. The cubic root of 4089421 is about 159.9142900320.

The spelling of 4089421 in words is "four million, eighty-nine thousand, four hundred twenty-one".