16404559 has 2 divisors, whose sum is σ = 16404560. Its totient is φ = 16404558.

The previous prime is 16404529. The next prime is 16404571. The reversal of 16404559 is 95540461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16404559 - 2⁵ = 16404527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16404529) 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, 8202279 + 8202280.

It is an arithmetic number, because the mean of its divisors is an integer number (8202280).

Almost surely, 2^16404559 is an apocalyptic number.

16404559 is a deficient number, since it is larger than the sum of its proper divisors (1).

16404559 is an equidigital number, since it uses as much as digits as its factorization.

16404559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 16404559 is about 4050.2541895540. The cubic root of 16404559 is about 254.0903588657.

The spelling of 16404559 in words is "sixteen million, four hundred four thousand, five hundred fifty-nine".