18388071 has 12 divisors (see below), whose sum is σ = 28603848. Its totient is φ = 11315664.

The previous prime is 18388037. The next prime is 18388087. The reversal of 18388071 is 17088381.

It is not a de Polignac number, because 18388071 - 2²³ = 9999463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18388021) 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 11 ways as a sum of consecutive naturals, for example, 78465 + ... + 78698.

It is an arithmetic number, because the mean of its divisors is an integer number (2383654).

Almost surely, 2^18388071 is an apocalyptic number.

18388071 is a deficient number, since it is larger than the sum of its proper divisors (10215777).

18388071 is a wasteful number, since it uses less digits than its factorization.

18388071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157182 (or 157179 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 18388071 is about 4288.1314112326. The cubic root of 18388071 is about 263.9441600218.

The spelling of 18388071 in words is "eighteen million, three hundred eighty-eight thousand, seventy-one".