It is a semiprime because it is the product of two primes.
It is a magnanimous number.
It is an Ulam number.
It is a Curzon number.
It is a plaindrome in base 5 and base 15.
It is a nialpdrome in base 16.
It is a congruent number.
It is an unprimeable number.
3974 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
23974 is an apocalyptic number.
3974 is a wasteful number, since it uses less digits than its factorization.
3974 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1989.
The square root of 3974 is about 63.0396700499. The cubic root of 3974 is about 15.8395420403.
The spelling of 3974 in words is "three thousand, nine hundred seventy-four".