18905089 has 4 divisors (see below), whose sum is σ = 21605824. Its totient is φ = 16204356.

The previous prime is 18905087. The next prime is 18905101. The reversal of 18905089 is 98050981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98050981 = 7 ⋅14007283.

It is not a de Polignac number, because 18905089 - 2¹ = 18905087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18905087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350357 + ... + 1350370.

It is an arithmetic number, because the mean of its divisors is an integer number (5401456).

Almost surely, 2^18905089 is an apocalyptic number.

It is an amenable number.

18905089 is a deficient number, since it is larger than the sum of its proper divisors (2700735).

18905089 is an equidigital number, since it uses as much as digits as its factorization.

18905089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700734.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 18905089 is about 4347.9982750687. The cubic root of 18905089 is about 266.3951060147.

The spelling of 18905089 in words is "eighteen million, nine hundred five thousand, eighty-nine".