3946 has 4 divisors (see below), whose sum is σ = 5922. Its totient is φ = 1972.

The previous prime is 3943. The next prime is 3947. The reversal of 3946 is 6493.

It can be divided in two parts, 394 and 6, that added together give a square (400 = 20^{2}).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6493 = 43 ⋅151.

It can be written as a sum of positive squares in only one way, i.e., 3721 + 225 = 61^2 + 15^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as **3**^{7} + **4**^{5} + **9**^{3} + **6** .

It is a plaindrome in base 12.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (3943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985 + ... + 988.

2^{3946} is an apocalyptic number.

3946 is a deficient number, since it is larger than the sum of its proper divisors (1976).

3946 is a wasteful number, since it uses less digits than its factorization.

3946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975.

The product of its digits is 648, while the sum is 22.

The square root of 3946 is about 62.8171950982. The cubic root of 3946 is about 15.8022535909.

The spelling of 3946 in words is "three thousand, nine hundred forty-six".

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