18845421 has 8 divisors (see below), whose sum is σ = 28716864. Its totient is φ = 10768800.

The previous prime is 18845419. The next prime is 18845479. The reversal of 18845421 is 12454881.

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

It is not a de Polignac number, because 18845421 - 2¹ = 18845419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18845221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448680 + ... + 448721.

It is an arithmetic number, because the mean of its divisors is an integer number (3589608).

Almost surely, 2^18845421 is an apocalyptic number.

It is an amenable number.

18845421 is a deficient number, since it is larger than the sum of its proper divisors (9871443).

18845421 is an equidigital number, since it uses as much as digits as its factorization.

18845421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897411.

The product of its digits is 10240, while the sum is 33.

The square root of 18845421 is about 4341.1313041648. The cubic root of 18845421 is about 266.1145463661.

The spelling of 18845421 in words is "eighteen million, eight hundred forty-five thousand, four hundred twenty-one".