18824089 has 4 divisors (see below), whose sum is σ = 18892324. Its totient is φ = 18755856.

The previous prime is 18824087. The next prime is 18824093. The reversal of 18824089 is 98042881.

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 1742400 + 17081689 = 1320^2 + 4133^2 .

It is a cyclic number.

It is not a de Polignac number, because 18824089 - 2¹ = 18824087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18824087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33702 + ... + 34255.

It is an arithmetic number, because the mean of its divisors is an integer number (4723081).

Almost surely, 2^18824089 is an apocalyptic number.

It is an amenable number.

18824089 is a deficient number, since it is larger than the sum of its proper divisors (68235).

18824089 is an equidigital number, since it uses as much as digits as its factorization.

18824089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68234.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 18824089 is about 4338.6736452515. The cubic root of 18824089 is about 266.0140993525.

The spelling of 18824089 in words is "eighteen million, eight hundred twenty-four thousand, eighty-nine".