16819919 has 8 divisors (see below), whose sum is σ = 17845920. Its totient is φ = 15798016.

The previous prime is 16819909. The next prime is 16819927. The reversal of 16819919 is 91991861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16819919 - 2¹⁶ = 16754383 is a prime.

It is a super-2 number, since 2×16819919² = 565819350333122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16819919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16819909) 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 7 ways as a sum of consecutive naturals, for example, 13142 + ... + 14364.

It is an arithmetic number, because the mean of its divisors is an integer number (2230740).

Almost surely, 2^16819919 is an apocalyptic number.

16819919 is a deficient number, since it is larger than the sum of its proper divisors (1026001).

16819919 is a wasteful number, since it uses less digits than its factorization.

16819919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049.

The product of its digits is 34992, while the sum is 44.

The square root of 16819919 is about 4101.2094557581. The cubic root of 16819919 is about 256.2170146715.

The spelling of 16819919 in words is "sixteen million, eight hundred nineteen thousand, nine hundred nineteen".