16671987 has 48 divisors (see below), whose sum is σ = 27605760. Its totient is φ = 10007712.

The previous prime is 16671983. The next prime is 16671989. The reversal of 16671987 is 78917661.

It is not a de Polignac number, because 16671987 - 2² = 16671983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16671983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106113 + ... + 106269.

It is an arithmetic number, because the mean of its divisors is an integer number (575120).

Almost surely, 2^16671987 is an apocalyptic number.

16671987 is a deficient number, since it is larger than the sum of its proper divisors (10933773).

16671987 is a wasteful number, since it uses less digits than its factorization.

16671987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 202 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 16671987 is about 4083.1344577420. The cubic root of 16671987 is about 255.4636547170.

The spelling of 16671987 in words is "sixteen million, six hundred seventy-one thousand, nine hundred eighty-seven".