18394161 has 4 divisors (see below), whose sum is σ = 24525552. Its totient is φ = 12262772.

The previous prime is 18394141. The next prime is 18394169. The reversal of 18394161 is 16149381.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18394161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18394169) 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, 3065691 + ... + 3065696.

It is an arithmetic number, because the mean of its divisors is an integer number (6131388).

Almost surely, 2^18394161 is an apocalyptic number.

It is an amenable number.

18394161 is a deficient number, since it is larger than the sum of its proper divisors (6131391).

18394161 is an equidigital number, since it uses as much as digits as its factorization.

18394161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6131390.

The product of its digits is 5184, while the sum is 33.

The square root of 18394161 is about 4288.8414519541. The cubic root of 18394161 is about 263.9732956230.

The spelling of 18394161 in words is "eighteen million, three hundred ninety-four thousand, one hundred sixty-one".