16690187 has 4 divisors (see below), whose sum is σ = 16710096. Its totient is φ = 16670280.

The previous prime is 16690133. The next prime is 16690211. The reversal of 16690187 is 78109661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78109661 = 7 ⋅11158523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16690187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16690187.

It is not an unprimeable number, because it can be changed into a prime (16692187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8639 + ... + 10392.

It is an arithmetic number, because the mean of its divisors is an integer number (4177524).

Almost surely, 2^16690187 is an apocalyptic number.

16690187 is a deficient number, since it is larger than the sum of its proper divisors (19909).

16690187 is an equidigital number, since it uses as much as digits as its factorization.

16690187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19908.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 16690187 is about 4085.3625298130. The cubic root of 16690187 is about 255.5565800071.

The spelling of 16690187 in words is "sixteen million, six hundred ninety thousand, one hundred eighty-seven".