18989641 has 8 divisors (see below), whose sum is σ = 20760768. Its totient is φ = 17226000.

The previous prime is 18989627. The next prime is 18989669. The reversal of 18989641 is 14698981.

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

It is not a de Polignac number, because 18989641 - 2¹⁷ = 18858569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18989591 and 18989600.

It is not an unprimeable number, because it can be changed into a prime (18989671) 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, 4356 + ... + 7546.

It is an arithmetic number, because the mean of its divisors is an integer number (2595096).

Almost surely, 2^18989641 is an apocalyptic number.

18989641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18989641 is a deficient number, since it is larger than the sum of its proper divisors (1771127).

18989641 is a wasteful number, since it uses less digits than its factorization.

18989641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3743.

The product of its digits is 124416, while the sum is 46.

The square root of 18989641 is about 4357.7105227401. The cubic root of 18989641 is about 266.7916613673.

The spelling of 18989641 in words is "eighteen million, nine hundred eighty-nine thousand, six hundred forty-one".