18008741 has 4 divisors (see below), whose sum is σ = 18017472. Its totient is φ = 18000012.

The previous prime is 18008693. The next prime is 18008777. The reversal of 18008741 is 14780081.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18008741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008041) 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 3 ways as a sum of consecutive naturals, for example, 650 + ... + 6036.

It is an arithmetic number, because the mean of its divisors is an integer number (4504368).

Almost surely, 2^18008741 is an apocalyptic number.

It is an amenable number.

18008741 is a deficient number, since it is larger than the sum of its proper divisors (8731).

18008741 is an equidigital number, since it uses as much as digits as its factorization.

18008741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 18008741 is about 4243.6706988172. The cubic root of 18008741 is about 262.1165545939.

The spelling of 18008741 in words is "eighteen million, eight thousand, seven hundred forty-one".