18421453 has 4 divisors (see below), whose sum is σ = 18447520. Its totient is φ = 18395388.

The previous prime is 18421439. The next prime is 18421483. The reversal of 18421453 is 35412481.

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 a de Polignac number, because none of the positive numbers 2^k-18421453 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 (18421433) 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, 11943 + ... + 13396.

It is an arithmetic number, because the mean of its divisors is an integer number (4611880).

Almost surely, 2^18421453 is an apocalyptic number.

It is an amenable number.

18421453 is a deficient number, since it is larger than the sum of its proper divisors (26067).

18421453 is an equidigital number, since it uses as much as digits as its factorization.

18421453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26066.

The product of its digits is 3840, while the sum is 28.

The square root of 18421453 is about 4292.0220176509. The cubic root of 18421453 is about 264.1037862899.

The spelling of 18421453 in words is "eighteen million, four hundred twenty-one thousand, four hundred fifty-three".