16887987 has 16 divisors (see below), whose sum is σ = 26491680. Its totient is φ = 10596096.

The previous prime is 16887971. The next prime is 16888007. The reversal of 16887987 is 78978861.

It is not a de Polignac number, because 16887987 - 2⁴ = 16887971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16887967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17938 + ... + 18855.

It is an arithmetic number, because the mean of its divisors is an integer number (1655730).

Almost surely, 2^16887987 is an apocalyptic number.

16887987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

16887987 is a deficient number, since it is larger than the sum of its proper divisors (9603693).

16887987 is a wasteful number, since it uses less digits than its factorization.

16887987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36819 (or 36813 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 16887987 is about 4109.4996045747. The cubic root of 16887987 is about 256.5621750033.

The spelling of 16887987 in words is "sixteen million, eight hundred eighty-seven thousand, nine hundred eighty-seven".