39946 has 4 divisors (see below), whose sum is σ = 59922. Its totient is φ = 19972.

The previous prime is 39937. The next prime is 39953. The reversal of 39946 is 64993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64993 = 103 ⋅631.

It can be written as a sum of positive squares in only one way, i.e., 35721 + 4225 = 189^2 + 65^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9985 + ... + 9988.

2³⁹⁹⁴⁶ is an apocalyptic number.

39946 is a deficient number, since it is larger than the sum of its proper divisors (19976).

39946 is a wasteful number, since it uses less digits than its factorization.

39946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19975.

The product of its digits is 5832, while the sum is 31.

The square root of 39946 is about 199.8649544067. The cubic root of 39946 is about 34.1841222194.

The spelling of 39946 in words is "thirty-nine thousand, nine hundred forty-six".