39945842 has 16 divisors (see below), whose sum is σ = 60648000. Its totient is φ = 19731600.

The previous prime is 39945827. The next prime is 39945853. The reversal of 39945842 is 24854993.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 39945793 and 39945802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105209 + ... + 105587.

It is an arithmetic number, because the mean of its divisors is an integer number (3790500).

Almost surely, 2^39945842 is an apocalyptic number.

39945842 is a deficient number, since it is larger than the sum of its proper divisors (20702158).

39945842 is a wasteful number, since it uses less digits than its factorization.

39945842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its digits is 311040, while the sum is 44.

The square root of 39945842 is about 6320.2723042603. The cubic root of 39945842 is about 341.8407714941.

The spelling of 39945842 in words is "thirty-nine million, nine hundred forty-five thousand, eight hundred forty-two".