16688923 has 2 divisors, whose sum is σ = 16688924. Its totient is φ = 16688922.

The previous prime is 16688921. The next prime is 16688939. The reversal of 16688923 is 32988661.

It is a weak prime.

It is an emirp because it is prime and its reverse (32988661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16688923 - 2¹ = 16688921 is a prime.

Together with 16688921, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16688923.

It is not a weakly prime, because it can be changed into another prime (16688921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344461 + 8344462.

It is an arithmetic number, because the mean of its divisors is an integer number (8344462).

Almost surely, 2^16688923 is an apocalyptic number.

16688923 is a deficient number, since it is larger than the sum of its proper divisors (1).

16688923 is an equidigital number, since it uses as much as digits as its factorization.

16688923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 16688923 is about 4085.2078282506. The cubic root of 16688923 is about 255.5501284782.

The spelling of 16688923 in words is "sixteen million, six hundred eighty-eight thousand, nine hundred twenty-three".