16840399 has 2 divisors, whose sum is σ = 16840400. Its totient is φ = 16840398.

The previous prime is 16840367. The next prime is 16840433. The reversal of 16840399 is 99304861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16840399 - 2⁵ = 16840367 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16840309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8420199 + 8420200.

It is an arithmetic number, because the mean of its divisors is an integer number (8420200).

Almost surely, 2^16840399 is an apocalyptic number.

16840399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16840399 is an equidigital number, since it uses as much as digits as its factorization.

16840399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 16840399 is about 4103.7055206240. The cubic root of 16840399 is about 256.3209627777.

The spelling of 16840399 in words is "sixteen million, eight hundred forty thousand, three hundred ninety-nine".