18687005 has 16 divisors (see below), whose sum is σ = 23048064. Its totient is φ = 14539200.

The previous prime is 18686999. The next prime is 18687007. The reversal of 18687005 is 50078681.

It is a happy number.

It is not a de Polignac number, because 18687005 - 2⁴ = 18686989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18687007) 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 15 ways as a sum of consecutive naturals, for example, 39782 + ... + 40248.

It is an arithmetic number, because the mean of its divisors is an integer number (1440504).

Almost surely, 2^18687005 is an apocalyptic number.

It is an amenable number.

18687005 is a deficient number, since it is larger than the sum of its proper divisors (4361059).

18687005 is a wasteful number, since it uses less digits than its factorization.

18687005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 18687005 is about 4322.8468628902. The cubic root of 18687005 is about 265.3667876908.

The spelling of 18687005 in words is "eighteen million, six hundred eighty-seven thousand, five".