18968305 has 8 divisors (see below), whose sum is σ = 22987944. Its totient is φ = 15024000.

The previous prime is 18968231. The next prime is 18968317. The reversal of 18968305 is 50386981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2509056 + 16459249 = 1584^2 + 4057^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18968305 - 2¹⁷ = 18837233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18276 + ... + 19285.

It is an arithmetic number, because the mean of its divisors is an integer number (2873493).

Almost surely, 2^18968305 is an apocalyptic number.

It is an amenable number.

18968305 is a deficient number, since it is larger than the sum of its proper divisors (4019639).

18968305 is a wasteful number, since it uses less digits than its factorization.

18968305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37667.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 18968305 is about 4355.2617602160. The cubic root of 18968305 is about 266.6917051142.

It can be divided in two parts, 1896 and 8305, that added together give a palindrome (10201).

The spelling of 18968305 in words is "eighteen million, nine hundred sixty-eight thousand, three hundred five".