18234181 has 8 divisors (see below), whose sum is σ = 21181184. Its totient is φ = 15372720.

The previous prime is 18234179. The next prime is 18234199. The reversal of 18234181 is 18143281.

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 18234181 - 2¹ = 18234179 is a prime.

It is a super-2 number, since 2×18234181² = 664970713481522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18234131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20925 + ... + 21778.

It is an arithmetic number, because the mean of its divisors is an integer number (2647648).

Almost surely, 2^18234181 is an apocalyptic number.

It is an amenable number.

18234181 is a deficient number, since it is larger than the sum of its proper divisors (2947003).

18234181 is an equidigital number, since it uses as much as digits as its factorization.

18234181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42771.

The product of its digits is 1536, while the sum is 28.

The square root of 18234181 is about 4270.1499973654. The cubic root of 18234181 is about 263.2057789910.

The spelling of 18234181 in words is "eighteen million, two hundred thirty-four thousand, one hundred eighty-one".