39905047 has 8 divisors (see below), whose sum is σ = 49114016. Its totient is φ = 31573152.

The previous prime is 39905039. The next prime is 39905077. The reversal of 39905047 is 74050993.

39905047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39905047 - 2³ = 39905039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39904997 and 39905015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39905017) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 219168 + ... + 219349.

It is an arithmetic number, because the mean of its divisors is an integer number (6139252).

Almost surely, 2^39905047 is an apocalyptic number.

39905047 is a deficient number, since it is larger than the sum of its proper divisors (9208969).

39905047 is a wasteful number, since it uses less digits than its factorization.

39905047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438537.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 39905047 is about 6317.0441663803. The cubic root of 39905047 is about 341.7243626804.

The spelling of 39905047 in words is "thirty-nine million, nine hundred five thousand, forty-seven".