39644013 has 8 divisors (see below), whose sum is σ = 55640800. Its totient is φ = 25038288.

The previous prime is 39643999. The next prime is 39644021. The reversal of 39644013 is 31044693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39644013 - 2⁹ = 39643501 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 (39644093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347698 + ... + 347811.

It is an arithmetic number, because the mean of its divisors is an integer number (6955100).

Almost surely, 2^39644013 is an apocalyptic number.

It is an amenable number.

39644013 is a deficient number, since it is larger than the sum of its proper divisors (15996787).

39644013 is a wasteful number, since it uses less digits than its factorization.

39644013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695531.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 39644013 is about 6296.3491802790. The cubic root of 39644013 is about 340.9776159689.

The spelling of 39644013 in words is "thirty-nine million, six hundred forty-four thousand, thirteen".