39648643 has 4 divisors (see below), whose sum is σ = 39682440. Its totient is φ = 39614848.

The previous prime is 39648629. The next prime is 39648647. The reversal of 39648643 is 34684693.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39648643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39648643.

It is not an unprimeable number, because it can be changed into a prime (39648647) 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, 15073 + ... + 17506.

It is an arithmetic number, because the mean of its divisors is an integer number (9920610).

Almost surely, 2^39648643 is an apocalyptic number.

39648643 is a deficient number, since it is larger than the sum of its proper divisors (33797).

39648643 is a wasteful number, since it uses less digits than its factorization.

39648643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33796.

The product of its digits is 373248, while the sum is 43.

The square root of 39648643 is about 6296.7168429270. The cubic root of 39648643 is about 340.9908896412.

The spelling of 39648643 in words is "thirty-nine million, six hundred forty-eight thousand, six hundred forty-three".