It is a happy number.
3654 is nontrivially palindromic in base 13.
3654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
3654 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.
It is an alternating number because its digits alternate between odd and even.
It is a Curzon number.
It is a plaindrome in base 15.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3654.
It is the 27-th tetrahedral number.
23654 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 3654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4680).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3654 is a wasteful number, since it uses less digits than its factorization.
3654 is an evil number, because the sum of its binary digits is even.
The square root of 3654 is about 60.4483250388. The cubic root of 3654 is about 15.4024395978.
Subtracting 3654 from its reverse (4563), we obtain a palindrome (909).
The spelling of 3654 in words is "three thousand, six hundred fifty-four".