39931243 has 8 divisors (see below), whose sum is σ = 45455616. Its totient is φ = 34722600.

The previous prime is 39931237. The next prime is 39931267. The reversal of 39931243 is 34213993.

39931243 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 39931243 - 2¹⁷ = 39800171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39931199 and 39931208.

It is not an unprimeable number, because it can be changed into a prime (39931273) 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, 78663 + ... + 79168.

It is an arithmetic number, because the mean of its divisors is an integer number (5681952).

Almost surely, 2^39931243 is an apocalyptic number.

39931243 is a deficient number, since it is larger than the sum of its proper divisors (5524373).

39931243 is a wasteful number, since it uses less digits than its factorization.

39931243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157865.

The product of its digits is 17496, while the sum is 34.

The square root of 39931243 is about 6319.1172643020. The cubic root of 39931243 is about 341.7991222572.

The spelling of 39931243 in words is "thirty-nine million, nine hundred thirty-one thousand, two hundred forty-three".