18160987 has 4 divisors (see below), whose sum is σ = 19558000. Its totient is φ = 16763976.

The previous prime is 18160973. The next prime is 18160993. The reversal of 18160987 is 78906181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18160987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18160907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698487 + ... + 698512.

It is an arithmetic number, because the mean of its divisors is an integer number (4889500).

Almost surely, 2^18160987 is an apocalyptic number.

18160987 is a deficient number, since it is larger than the sum of its proper divisors (1397013).

18160987 is a wasteful number, since it uses less digits than its factorization.

18160987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397012.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18160987 is about 4261.5709544721. The cubic root of 18160987 is about 262.8531277658.

The spelling of 18160987 in words is "eighteen million, one hundred sixty thousand, nine hundred eighty-seven".