18421441 has 6 divisors (see below), whose sum is σ = 18606770. Its totient is φ = 18237936.

The previous prime is 18421439. The next prime is 18421483. The reversal of 18421441 is 14412481.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 103041 = 4280^2 + 321^2 .

It is not a de Polignac number, because 18421441 - 2¹ = 18421439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18421411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10645 + ... + 12253.

Almost surely, 2^18421441 is an apocalyptic number.

It is an amenable number.

18421441 is a deficient number, since it is larger than the sum of its proper divisors (185329).

18421441 is an equidigital number, since it uses as much as digits as its factorization.

18421441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823 (or 1716 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 18421441 is about 4292.0206197082. The cubic root of 18421441 is about 264.1037289429.

The spelling of 18421441 in words is "eighteen million, four hundred twenty-one thousand, four hundred forty-one".