39921043 has 4 divisors (see below), whose sum is σ = 39955168. Its totient is φ = 39886920.

The previous prime is 39921041. The next prime is 39921047. The reversal of 39921043 is 34012993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39921043 - 2¹ = 39921041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39920996 and 39921014.

It is not an unprimeable number, because it can be changed into a prime (39921041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15243 + ... + 17668.

It is an arithmetic number, because the mean of its divisors is an integer number (9988792).

Almost surely, 2^39921043 is an apocalyptic number.

39921043 is a deficient number, since it is larger than the sum of its proper divisors (34125).

39921043 is a wasteful number, since it uses less digits than its factorization.

39921043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34124.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 39921043 is about 6318.3101380037. The cubic root of 39921043 is about 341.7700168277.

The spelling of 39921043 in words is "thirty-nine million, nine hundred twenty-one thousand, forty-three".