18384081 has 8 divisors (see below), whose sum is σ = 24593184. Its totient is φ = 12215520.

The previous prime is 18384073. The next prime is 18384109. The reversal of 18384081 is 18048381.

It is a happy number.

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

It is not a de Polignac number, because 18384081 - 2³ = 18384073 is a prime.

It is a super-2 number, since 2×18384081² = 675948868429122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18384181) 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, 9060 + ... + 10901.

It is an arithmetic number, because the mean of its divisors is an integer number (3074148).

Almost surely, 2^18384081 is an apocalyptic number.

It is an amenable number.

18384081 is a deficient number, since it is larger than the sum of its proper divisors (6209103).

18384081 is a wasteful number, since it uses less digits than its factorization.

18384081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20271.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 18384081 is about 4287.6661483842. Note that the first 3 decimals coincide. The cubic root of 18384081 is about 263.9250676914.

It can be divided in two parts, 183840 and 81, that added together give a triangular number (183921 = T₆₀₆).

The spelling of 18384081 in words is "eighteen million, three hundred eighty-four thousand, eighty-one".