208123100 has 36 divisors (see below), whose sum is σ = 452330424. Its totient is φ = 83119680.

The previous prime is 208123099. The next prime is 208123109. The reversal of 208123100 is 1321802.

It is a super-2 number, since 2×208123100² = 86630449507220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208123109) 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, 87122 + ... + 89478.

It is an arithmetic number, because the mean of its divisors is an integer number (12564734).

Almost surely, 2^208123100 is an apocalyptic number.

208123100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208123100 is an abundant number, since it is smaller than the sum of its proper divisors (244207324).

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

208123100 is a wasteful number, since it uses less digits than its factorization.

208123100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254 (or 3247 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 208123100 is about 14426.4721952389. The cubic root of 208123100 is about 592.6160762925.

Adding to 208123100 its reverse (1321802), we get a palindrome (209444902).

The spelling of 208123100 in words is "two hundred eight million, one hundred twenty-three thousand, one hundred".