208109000 has 64 divisors (see below), whose sum is σ = 531273600. Its totient is φ = 75672000.

The previous prime is 208108981. The next prime is 208109029. The reversal of 208109000 is 901802.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1541 + ... + 20459.

It is an arithmetic number, because the mean of its divisors is an integer number (8301150).

Almost surely, 2^208109000 is an apocalyptic number.

208109000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208109000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265636800).

208109000 is an abundant number, since it is smaller than the sum of its proper divisors (323164600).

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

208109000 is a wasteful number, since it uses less digits than its factorization.

208109000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18951 (or 18937 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 208109000 is about 14425.9835020008. The cubic root of 208109000 is about 592.6026930667.

The spelling of 208109000 in words is "two hundred eight million, one hundred nine thousand".