18830641 has 4 divisors (see below), whose sum is σ = 18847332. Its totient is φ = 18813952.

The previous prime is 18830633. The next prime is 18830663. The reversal of 18830641 is 14603881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7134241 + 11696400 = 2671^2 + 3420^2 .

It is a cyclic number.

It is not a de Polignac number, because 18830641 - 2³ = 18830633 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18830681) 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, 6520 + ... + 8953.

It is an arithmetic number, because the mean of its divisors is an integer number (4711833).

Almost surely, 2^18830641 is an apocalyptic number.

It is an amenable number.

18830641 is a deficient number, since it is larger than the sum of its proper divisors (16691).

18830641 is a wasteful number, since it uses less digits than its factorization.

18830641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16690.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18830641 is about 4339.4286490274. The cubic root of 18830641 is about 266.0449591408.

The spelling of 18830641 in words is "eighteen million, eight hundred thirty thousand, six hundred forty-one".