39943305 has 12 divisors (see below), whose sum is σ = 69235140. Its totient is φ = 21303072.

The previous prime is 39943303. The next prime is 39943327. The reversal of 39943305 is 50334993.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20548089 + 19395216 = 4533^2 + 4404^2 .

It is not a de Polignac number, because 39943305 - 2¹ = 39943303 is a prime.

It is a super-2 number, since 2×39943305² = 3190935228646050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39943305.

It is not an unprimeable number, because it can be changed into a prime (39943303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 443770 + ... + 443859.

It is an arithmetic number, because the mean of its divisors is an integer number (5769595).

Almost surely, 2^39943305 is an apocalyptic number.

It is an amenable number.

39943305 is a deficient number, since it is larger than the sum of its proper divisors (29291835).

39943305 is a wasteful number, since it uses less digits than its factorization.

39943305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887640 (or 887637 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 36.

The square root of 39943305 is about 6320.0715976957. The cubic root of 39943305 is about 341.8335344589.

The spelling of 39943305 in words is "thirty-nine million, nine hundred forty-three thousand, three hundred five".