18075639 has 4 divisors (see below), whose sum is σ = 24100856. Its totient is φ = 12050424.

The previous prime is 18075623. The next prime is 18075649. The reversal of 18075639 is 93657081.

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

It is not a de Polignac number, because 18075639 - 2⁴ = 18075623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18075597 and 18075606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18075649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3012604 + ... + 3012609.

It is an arithmetic number, because the mean of its divisors is an integer number (6025214).

Almost surely, 2^18075639 is an apocalyptic number.

18075639 is a deficient number, since it is larger than the sum of its proper divisors (6025217).

18075639 is an equidigital number, since it uses as much as digits as its factorization.

18075639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6025216.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 18075639 is about 4251.5454837035. The cubic root of 18075639 is about 262.4407194935.

The spelling of 18075639 in words is "eighteen million, seventy-five thousand, six hundred thirty-nine".