18704161 has 4 divisors (see below), whose sum is σ = 21376192. Its totient is φ = 16032132.

The previous prime is 18704137. The next prime is 18704171. The reversal of 18704161 is 16140781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16140781 = 43 ⋅375367.

It is a cyclic number.

It is not a de Polignac number, because 18704161 - 2¹⁹ = 18179873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18704111) 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, 1336005 + ... + 1336018.

It is an arithmetic number, because the mean of its divisors is an integer number (5344048).

Almost surely, 2^18704161 is an apocalyptic number.

It is an amenable number.

18704161 is a deficient number, since it is larger than the sum of its proper divisors (2672031).

18704161 is an equidigital number, since it uses as much as digits as its factorization.

18704161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672030.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 18704161 is about 4324.8307481334. The cubic root of 18704161 is about 265.4479713815.

The spelling of 18704161 in words is "eighteen million, seven hundred four thousand, one hundred sixty-one".