39947113 has 4 divisors (see below), whose sum is σ = 41683968. Its totient is φ = 38210260.

The previous prime is 39947057. The next prime is 39947119. The reversal of 39947113 is 31174993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39947113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39947119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868393 + ... + 868438.

It is an arithmetic number, because the mean of its divisors is an integer number (10420992).

Almost surely, 2^39947113 is an apocalyptic number.

It is an amenable number.

39947113 is a deficient number, since it is larger than the sum of its proper divisors (1736855).

39947113 is a wasteful number, since it uses less digits than its factorization.

39947113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736854.

The product of its digits is 20412, while the sum is 37.

The square root of 39947113 is about 6320.3728529257. The cubic root of 39947113 is about 341.8443970280.

The spelling of 39947113 in words is "thirty-nine million, nine hundred forty-seven thousand, one hundred thirteen".