16604639 has 2 divisors, whose sum is σ = 16604640. Its totient is φ = 16604638.

The previous prime is 16604633. The next prime is 16604657. The reversal of 16604639 is 93640661.

It is a weak prime.

It is an emirp because it is prime and its reverse (93640661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16604639 - 2²⁰ = 15556063 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16604599 and 16604608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16604633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302319 + 8302320.

It is an arithmetic number, because the mean of its divisors is an integer number (8302320).

Almost surely, 2^16604639 is an apocalyptic number.

16604639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16604639 is an equidigital number, since it uses as much as digits as its factorization.

16604639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 16604639 is about 4074.8790166090. The cubic root of 16604639 is about 255.1192009664.

The spelling of 16604639 in words is "sixteen million, six hundred four thousand, six hundred thirty-nine".