18921065 has 8 divisors (see below), whose sum is σ = 23692608. Its totient is φ = 14478640.

The previous prime is 18921047. The next prime is 18921073. The reversal of 18921065 is 56012981.

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

It is not a de Polignac number, because 18921065 - 2⁸ = 18920809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82151 + ... + 82380.

It is an arithmetic number, because the mean of its divisors is an integer number (2961576).

Almost surely, 2^18921065 is an apocalyptic number.

It is an amenable number.

18921065 is a deficient number, since it is larger than the sum of its proper divisors (4771543).

18921065 is a wasteful number, since it uses less digits than its factorization.

18921065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164559.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 18921065 is about 4349.8350543440. The cubic root of 18921065 is about 266.4701251437.

The spelling of 18921065 in words is "eighteen million, nine hundred twenty-one thousand, sixty-five".