18018071 has 4 divisors (see below), whose sum is σ = 18028272. Its totient is φ = 18007872.

The previous prime is 18018067. The next prime is 18018073. The reversal of 18018071 is 17081081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18018071 - 2² = 18018067 is a prime.

It is a super-2 number, since 2×18018071² = 649301765122082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18018071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018073) 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, 1691 + ... + 6236.

It is an arithmetic number, because the mean of its divisors is an integer number (4507068).

Almost surely, 2^18018071 is an apocalyptic number.

18018071 is a deficient number, since it is larger than the sum of its proper divisors (10201).

18018071 is an equidigital number, since it uses as much as digits as its factorization.

18018071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 18018071 is about 4244.7698406392. The cubic root of 18018071 is about 262.1618127132.

The spelling of 18018071 in words is "eighteen million, eighteen thousand, seventy-one".