18889505 has 4 divisors (see below), whose sum is σ = 22667412. Its totient is φ = 15111600.

The previous prime is 18889487. The next prime is 18889517. The reversal of 18889505 is 50598881.

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 10863616 + 8025889 = 3296^2 + 2833^2 .

It is not a de Polignac number, because 18889505 - 2¹⁶ = 18823969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1888946 + ... + 1888955.

It is an arithmetic number, because the mean of its divisors is an integer number (5666853).

Almost surely, 2^18889505 is an apocalyptic number.

It is an amenable number.

18889505 is a deficient number, since it is larger than the sum of its proper divisors (3777907).

18889505 is an equidigital number, since it uses as much as digits as its factorization.

18889505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3777906.

The product of its (nonzero) digits is 115200, while the sum is 44.

The square root of 18889505 is about 4346.2058165715. The cubic root of 18889505 is about 266.3218868833.

The spelling of 18889505 in words is "eighteen million, eight hundred eighty-nine thousand, five hundred five".