18043147 has 4 divisors (see below), whose sum is σ = 18625216. Its totient is φ = 17461080.

The previous prime is 18043099. The next prime is 18043163. The reversal of 18043147 is 74134081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18043147 - 2⁷ = 18043019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18043747) 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, 290988 + ... + 291049.

It is an arithmetic number, because the mean of its divisors is an integer number (4656304).

Almost surely, 2^18043147 is an apocalyptic number.

18043147 is a deficient number, since it is larger than the sum of its proper divisors (582069).

18043147 is an equidigital number, since it uses as much as digits as its factorization.

18043147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582068.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 18043147 is about 4247.7225662701. The cubic root of 18043147 is about 262.2833744178.

The spelling of 18043147 in words is "eighteen million, forty-three thousand, one hundred forty-seven".