18039071 has 4 divisors (see below), whose sum is σ = 18104472. Its totient is φ = 17973672.

The previous prime is 18039067. The next prime is 18039079. The reversal of 18039071 is 17093081.

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 18039071 - 2² = 18039067 is a prime.

It is a super-3 number, since 3×18039071³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039079) 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, 32285 + ... + 32838.

It is an arithmetic number, because the mean of its divisors is an integer number (4526118).

Almost surely, 2^18039071 is an apocalyptic number.

18039071 is a deficient number, since it is larger than the sum of its proper divisors (65401).

18039071 is an equidigital number, since it uses as much as digits as its factorization.

18039071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65400.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 18039071 is about 4247.2427526573. The cubic root of 18039071 is about 262.2636227351.

The spelling of 18039071 in words is "eighteen million, thirty-nine thousand, seventy-one".