208458117 has 20 divisors (see below), whose sum is σ = 355887136. Its totient is φ = 119118600.

The previous prime is 208458077. The next prime is 208458121. The reversal of 208458117 is 711854802.

It is not a de Polignac number, because 208458117 - 2⁷ = 208457989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208458127) 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 in 19 ways as a sum of consecutive naturals, for example, 183259 + ... + 184392.

Almost surely, 2^208458117 is an apocalyptic number.

208458117 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

208458117 is a deficient number, since it is larger than the sum of its proper divisors (147429019).

208458117 is an equidigital number, since it uses as much as digits as its factorization.

208458117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367670 (or 367661 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 208458117 is about 14438.0787156740. The cubic root of 208458117 is about 592.9338850425.

The spelling of 208458117 in words is "two hundred eight million, four hundred fifty-eight thousand, one hundred seventeen".