208806623 has 2 divisors, whose sum is σ = 208806624. Its totient is φ = 208806622.

The previous prime is 208806547. The next prime is 208806629. The reversal of 208806623 is 326608802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208806623 - 2¹⁰ = 208805599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208806629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104403311 + 104403312.

It is an arithmetic number, because the mean of its divisors is an integer number (104403312).

Almost surely, 2^208806623 is an apocalyptic number.

208806623 is a deficient number, since it is larger than the sum of its proper divisors (1).

208806623 is an equidigital number, since it uses as much as digits as its factorization.

208806623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 208806623 is about 14450.1426636556. The cubic root of 208806623 is about 593.2641287869.

The spelling of 208806623 in words is "two hundred eight million, eight hundred six thousand, six hundred twenty-three".