18146987 has 4 divisors (see below), whose sum is σ = 18163656. Its totient is φ = 18130320.

The previous prime is 18146981. The next prime is 18146993. The reversal of 18146987 is 78964181.

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

It is an interprime number because it is at equal distance from previous prime (18146981) and next prime (18146993).

It is a cyclic number.

It is not a de Polignac number, because 18146987 - 2⁴ = 18146971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18146981) 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, 6578 + ... + 8919.

It is an arithmetic number, because the mean of its divisors is an integer number (4540914).

Almost surely, 2^18146987 is an apocalyptic number.

18146987 is a deficient number, since it is larger than the sum of its proper divisors (16669).

18146987 is a wasteful number, since it uses less digits than its factorization.

18146987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16668.

The product of its digits is 96768, while the sum is 44.

The square root of 18146987 is about 4259.9280510356. The cubic root of 18146987 is about 262.7855673812.

The spelling of 18146987 in words is "eighteen million, one hundred forty-six thousand, nine hundred eighty-seven".