16819393 has 2 divisors, whose sum is σ = 16819394. Its totient is φ = 16819392.

The previous prime is 16819379. The next prime is 16819399. The reversal of 16819393 is 39391861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16418704 + 400689 = 4052^2 + 633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16819393 is a prime.

It is a super-3 number, since 3×16819393³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16819399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8409696 + 8409697.

It is an arithmetic number, because the mean of its divisors is an integer number (8409697).

Almost surely, 2^16819393 is an apocalyptic number.

It is an amenable number.

16819393 is a deficient number, since it is larger than the sum of its proper divisors (1).

16819393 is an equidigital number, since it uses as much as digits as its factorization.

16819393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 16819393 is about 4101.1453278322. The cubic root of 16819393 is about 256.2143437995.

The spelling of 16819393 in words is "sixteen million, eight hundred nineteen thousand, three hundred ninety-three".