18408161 has 8 divisors (see below), whose sum is σ = 19906560. Its totient is φ = 16955968.

The previous prime is 18408157. The next prime is 18408167. The reversal of 18408161 is 16180481.

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

It is a cyclic number.

It is not a de Polignac number, because 18408161 - 2² = 18408157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18408167) by changing a digit.

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, 10721 + ... + 12318.

It is an arithmetic number, because the mean of its divisors is an integer number (2488320).

Almost surely, 2^18408161 is an apocalyptic number.

It is an amenable number.

18408161 is a deficient number, since it is larger than the sum of its proper divisors (1498399).

18408161 is a wasteful number, since it uses less digits than its factorization.

18408161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23103.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18408161 is about 4290.4732839164. The cubic root of 18408161 is about 264.0402496407.

It can be divided in two parts, 1840 and 8161, that added together give a palindrome (10001).

The spelling of 18408161 in words is "eighteen million, four hundred eight thousand, one hundred sixty-one".