18804971 has 4 divisors (see below), whose sum is σ = 18859512. Its totient is φ = 18750432.

The previous prime is 18804967. The next prime is 18804977. The reversal of 18804971 is 17940881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17940881 = 7 ⋅2562983.

It is a cyclic number.

It is not a de Polignac number, because 18804971 - 2² = 18804967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18804977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26750 + ... + 27443.

It is an arithmetic number, because the mean of its divisors is an integer number (4714878).

Almost surely, 2^18804971 is an apocalyptic number.

18804971 is a deficient number, since it is larger than the sum of its proper divisors (54541).

18804971 is an equidigital number, since it uses as much as digits as its factorization.

18804971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54540.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18804971 is about 4336.4698776770. The cubic root of 18804971 is about 265.9240130060.

The spelling of 18804971 in words is "eighteen million, eight hundred four thousand, nine hundred seventy-one".