16919923 has 2 divisors, whose sum is σ = 16919924. Its totient is φ = 16919922.

The previous prime is 16919909. The next prime is 16919957. The reversal of 16919923 is 32991961.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16919923 is a prime.

It is not a weakly prime, because it can be changed into another prime (16919423) 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 as a sum of consecutive naturals, namely, 8459961 + 8459962.

It is an arithmetic number, because the mean of its divisors is an integer number (8459962).

Almost surely, 2^16919923 is an apocalyptic number.

16919923 is a deficient number, since it is larger than the sum of its proper divisors (1).

16919923 is an equidigital number, since it uses as much as digits as its factorization.

16919923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 40.

The square root of 16919923 is about 4113.3834005597. The cubic root of 16919923 is about 256.7237969939.

The spelling of 16919923 in words is "sixteen million, nine hundred nineteen thousand, nine hundred twenty-three".