39945679 has 4 divisors (see below), whose sum is σ = 39961600. Its totient is φ = 39929760.

The previous prime is 39945677. The next prime is 39945707. The reversal of 39945679 is 97654993.

39945679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97654993 = 1087 ⋅89839.

It is a cyclic number.

It is not a de Polignac number, because 39945679 - 2¹ = 39945677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39945677) 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 3 ways as a sum of consecutive naturals, for example, 3279 + ... + 9520.

It is an arithmetic number, because the mean of its divisors is an integer number (9990400).

Almost surely, 2^39945679 is an apocalyptic number.

39945679 is a deficient number, since it is larger than the sum of its proper divisors (15921).

39945679 is a wasteful number, since it uses less digits than its factorization.

39945679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15920.

The product of its digits is 1837080, while the sum is 52.

The square root of 39945679 is about 6320.2594092331. The cubic root of 39945679 is about 341.8403065303.

The spelling of 39945679 in words is "thirty-nine million, nine hundred forty-five thousand, six hundred seventy-nine".