208203906 has 16 divisors (see below), whose sum is σ = 416617344. Its totient is φ = 69366384.

The previous prime is 208203901. The next prime is 208203911. The reversal of 208203906 is 609302802.

It is an interprime number because it is at equal distance from previous prime (208203901) and next prime (208203911).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (208203901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6136 + ... + 21308.

It is an arithmetic number, because the mean of its divisors is an integer number (26038584).

Almost surely, 2^208203906 is an apocalyptic number.

208203906 is an abundant number, since it is smaller than the sum of its proper divisors (208413438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208203906 is a wasteful number, since it uses less digits than its factorization.

208203906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17465.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 208203906 is about 14429.2725388358. The cubic root of 208203906 is about 592.6927628600.

The spelling of 208203906 in words is "two hundred eight million, two hundred three thousand, nine hundred six".