39947764 has 6 divisors (see below), whose sum is σ = 69908594. Its totient is φ = 19973880.

The previous prime is 39947759. The next prime is 39947771. The reversal of 39947764 is 46774993.

39947764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 26316900 + 13630864 = 5130^2 + 3692^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993467 + ... + 4993474.

Almost surely, 2^39947764 is an apocalyptic number.

It is an amenable number.

39947764 is a deficient number, since it is larger than the sum of its proper divisors (29960830).

39947764 is a wasteful number, since it uses less digits than its factorization.

39947764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9986945 (or 9986943 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 49.

The square root of 39947764 is about 6320.4243528421. The cubic root of 39947764 is about 341.8462539790.

The spelling of 39947764 in words is "thirty-nine million, nine hundred forty-seven thousand, seven hundred sixty-four".