3900 divided by its sum of digits (12) gives a triangular number (325 = T25).
Adding to 3900 its reverse (93), we get a palindrome (3993).
3900 is nontrivially palindromic in base 7.
3900 is an undulating number in base 8.
It is a nialpdrome in base 5.
It is a zygodrome in base 2 and base 5.
It is a congruent number.
3900 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
23900 is an apocalyptic number.
3900 is a gapful number since it is divisible by the number (30) 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 3900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6076).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3900 is a wasteful number, since it uses less digits than its factorization.
3900 is an evil number, because the sum of its binary digits is even.
The square root of 3900 is about 62.4499799840. The cubic root of 3900 is about 15.7406091663.
The spelling of 3900 in words is "three thousand, nine hundred".