18984641 has 8 divisors (see below), whose sum is σ = 20521704. Its totient is φ = 17458560.

The previous prime is 18984613. The next prime is 18984643. The reversal of 18984641 is 14648981.

It can be written as a sum of positive squares in 4 ways, for example, as 1311025 + 17673616 = 1145^2 + 4204^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18984641 - 2⁶ = 18984577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18984643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1055 + ... + 6251.

It is an arithmetic number, because the mean of its divisors is an integer number (2565213).

Almost surely, 2^18984641 is an apocalyptic number.

It is an amenable number.

18984641 is a deficient number, since it is larger than the sum of its proper divisors (1537063).

18984641 is a wasteful number, since it uses less digits than its factorization.

18984641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491.

The product of its digits is 55296, while the sum is 41.

The square root of 18984641 is about 4357.1367892229. The cubic root of 18984641 is about 266.7682437682.

The spelling of 18984641 in words is "eighteen million, nine hundred eighty-four thousand, six hundred forty-one".