39947642 has 48 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 15900192.

The previous prime is 39947599. The next prime is 39947657. The reversal of 39947642 is 24674993.

39947642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 39947593 and 39947602.

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 in 23 ways as a sum of consecutive naturals, for example, 83159 + ... + 83637.

It is an arithmetic number, because the mean of its divisors is an integer number (1559520).

Almost surely, 2^39947642 is an apocalyptic number.

39947642 is a deficient number, since it is larger than the sum of its proper divisors (34909318).

39947642 is a wasteful number, since it uses less digits than its factorization.

39947642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555 (or 548 counting only the distinct ones).

The product of its digits is 326592, while the sum is 44.

The square root of 39947642 is about 6320.4147015841. The cubic root of 39947642 is about 341.8459059805.

The spelling of 39947642 in words is "thirty-nine million, nine hundred forty-seven thousand, six hundred forty-two".