16839391 has 2 divisors, whose sum is σ = 16839392. Its totient is φ = 16839390.

The previous prime is 16839379. The next prime is 16839409. The reversal of 16839391 is 19393861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16839391 - 2¹¹ = 16837343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16839341) 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, 8419695 + 8419696.

It is an arithmetic number, because the mean of its divisors is an integer number (8419696).

Almost surely, 2^16839391 is an apocalyptic number.

16839391 is a deficient number, since it is larger than the sum of its proper divisors (1).

16839391 is an equidigital number, since it uses as much as digits as its factorization.

16839391 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 16839391 is about 4103.5827029560. The cubic root of 16839391 is about 256.3158485543.

The spelling of 16839391 in words is "sixteen million, eight hundred thirty-nine thousand, three hundred ninety-one".