39947705 has 16 divisors (see below), whose sum is σ = 58008960. Its totient is φ = 25780992.

The previous prime is 39947689. The next prime is 39947749. The reversal of 39947705 is 50774993.

It is a happy number.

39947705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 39947705 - 2⁴ = 39947689 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 32975 + ... + 34164.

It is an arithmetic number, because the mean of its divisors is an integer number (3625560).

Almost surely, 2^39947705 is an apocalyptic number.

39947705 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39947705 is a deficient number, since it is larger than the sum of its proper divisors (18061255).

39947705 is a wasteful number, since it uses less digits than its factorization.

39947705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67168.

The product of its (nonzero) digits is 238140, while the sum is 44.

The square root of 39947705 is about 6320.4196854323. The cubic root of 39947705 is about 341.8460856848.

The spelling of 39947705 in words is "thirty-nine million, nine hundred forty-seven thousand, seven hundred five".