18816489 has 8 divisors (see below), whose sum is σ = 27876320. Its totient is φ = 12544308.

The previous prime is 18816463. The next prime is 18816503. The reversal of 18816489 is 98461881.

It is not a de Polignac number, because 18816489 - 2⁷ = 18816361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18816409) 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, 348427 + ... + 348480.

It is an arithmetic number, because the mean of its divisors is an integer number (3484540).

Almost surely, 2^18816489 is an apocalyptic number.

It is an amenable number.

18816489 is a deficient number, since it is larger than the sum of its proper divisors (9059831).

18816489 is an equidigital number, since it uses as much as digits as its factorization.

18816489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696916 (or 696910 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 18816489 is about 4337.7977131259. The cubic root of 18816489 is about 265.9782945336.

The spelling of 18816489 in words is "eighteen million, eight hundred sixteen thousand, four hundred eighty-nine".