16868687 has 4 divisors (see below), whose sum is σ = 18402216. Its totient is φ = 15335160.

The previous prime is 16868669. The next prime is 16868689. The reversal of 16868687 is 78686861.

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

It is a cyclic number.

It is not a de Polignac number, because 16868687 - 2⁸ = 16868431 is a prime.

It is a super-2 number, since 2×16868687² = 569105202207938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16868689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766748 + ... + 766769.

It is an arithmetic number, because the mean of its divisors is an integer number (4600554).

Almost surely, 2^16868687 is an apocalyptic number.

16868687 is a deficient number, since it is larger than the sum of its proper divisors (1533529).

16868687 is a wasteful number, since it uses less digits than its factorization.

16868687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533528.

The product of its digits is 774144, while the sum is 50.

The square root of 16868687 is about 4107.1507155204. The cubic root of 16868687 is about 256.4644025953.

The spelling of 16868687 in words is "sixteen million, eight hundred sixty-eight thousand, six hundred eighty-seven".