16881987 has 8 divisors (see below), whose sum is σ = 22548160. Its totient is φ = 11235240.

The previous prime is 16881979. The next prime is 16881989. The reversal of 16881987 is 78918861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16881987 - 2³ = 16881979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16881989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2689 + ... + 6402.

It is an arithmetic number, because the mean of its divisors is an integer number (2818520).

Almost surely, 2^16881987 is an apocalyptic number.

16881987 is a deficient number, since it is larger than the sum of its proper divisors (5666173).

16881987 is an equidigital number, since it uses as much as digits as its factorization.

16881987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9713.

The product of its digits is 193536, while the sum is 48.

The square root of 16881987 is about 4108.7695238356. The cubic root of 16881987 is about 256.5317874189.

The spelling of 16881987 in words is "sixteen million, eight hundred eighty-one thousand, nine hundred eighty-seven".