18589421 has 4 divisors (see below), whose sum is σ = 18655392. Its totient is φ = 18523452.

The previous prime is 18589409. The next prime is 18589423. The reversal of 18589421 is 12498581.

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 18589421 - 2¹⁰ = 18588397 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 (18589423) 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, 32561 + ... + 33126.

It is an arithmetic number, because the mean of its divisors is an integer number (4663848).

Almost surely, 2^18589421 is an apocalyptic number.

It is an amenable number.

18589421 is a deficient number, since it is larger than the sum of its proper divisors (65971).

18589421 is an equidigital number, since it uses as much as digits as its factorization.

18589421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65970.

The product of its digits is 23040, while the sum is 38.

The square root of 18589421 is about 4311.5450826821. The cubic root of 18589421 is about 264.9040640035.

The spelling of 18589421 in words is "eighteen million, five hundred eighty-nine thousand, four hundred twenty-one".