18906089 has 4 divisors (see below), whose sum is σ = 19093380. Its totient is φ = 18718800.

The previous prime is 18906067. The next prime is 18906131. The reversal of 18906089 is 98060981.

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 9954025 + 8952064 = 3155^2 + 2992^2 .

It is a cyclic number.

It is not a de Polignac number, because 18906089 - 2¹⁶ = 18840553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18906049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93494 + ... + 93695.

It is an arithmetic number, because the mean of its divisors is an integer number (4773345).

Almost surely, 2^18906089 is an apocalyptic number.

It is an amenable number.

18906089 is a deficient number, since it is larger than the sum of its proper divisors (187291).

18906089 is a wasteful number, since it uses less digits than its factorization.

18906089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187290.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 18906089 is about 4348.1132689938. The cubic root of 18906089 is about 266.3998029935.

The spelling of 18906089 in words is "eighteen million, nine hundred six thousand, eighty-nine".