18696921 has 8 divisors (see below), whose sum is σ = 25048224. Its totient is φ = 12405120.

The previous prime is 18696919. The next prime is 18696947. The reversal of 18696921 is 12969681.

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

It is not a de Polignac number, because 18696921 - 2¹ = 18696919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18696901) 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 7 ways as a sum of consecutive naturals, for example, 14136 + ... + 15401.

It is an arithmetic number, because the mean of its divisors is an integer number (3131028).

Almost surely, 2^18696921 is an apocalyptic number.

It is an amenable number.

18696921 is a deficient number, since it is larger than the sum of its proper divisors (6351303).

18696921 is a wasteful number, since it uses less digits than its factorization.

18696921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29751.

The product of its digits is 46656, while the sum is 42.

The square root of 18696921 is about 4323.9936401433. The cubic root of 18696921 is about 265.4137171259.

The spelling of 18696921 in words is "eighteen million, six hundred ninety-six thousand, nine hundred twenty-one".