18006241 has 4 divisors (see below), whose sum is σ = 19643184. Its totient is φ = 16369300.

The previous prime is 18006227. The next prime is 18006259. The reversal of 18006241 is 14260081.

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: 14260081 = 11 ⋅1296371.

It is a cyclic number.

It is not a de Polignac number, because 18006241 - 2⁷ = 18006113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18006221) 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, 818455 + ... + 818476.

It is an arithmetic number, because the mean of its divisors is an integer number (4910796).

Almost surely, 2^18006241 is an apocalyptic number.

18006241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18006241 is a deficient number, since it is larger than the sum of its proper divisors (1636943).

18006241 is a wasteful number, since it uses less digits than its factorization.

18006241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636942.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18006241 is about 4243.3761322796. The cubic root of 18006241 is about 262.1044248969.

The spelling of 18006241 in words is "eighteen million, six thousand, two hundred forty-one".