208109100 has 36 divisors (see below), whose sum is σ = 602129864. Its totient is φ = 55495680.

The previous prime is 208109093. The next prime is 208109101. The reversal of 208109100 is 1901802.

It is not an unprimeable number, because it can be changed into a prime (208109101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346549 + ... + 347148.

Almost surely, 2^208109100 is an apocalyptic number.

208109100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208109100 is an abundant number, since it is smaller than the sum of its proper divisors (394020764).

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

208109100 is a wasteful number, since it uses less digits than its factorization.

208109100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693714 (or 693707 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 208109100 is about 14425.9869679686. The cubic root of 208109100 is about 592.6027879853.

The spelling of 208109100 in words is "two hundred eight million, one hundred nine thousand, one hundred".