39561944 has 8 divisors (see below), whose sum is σ = 74178660. Its totient is φ = 19780968.

The previous prime is 39561943. The next prime is 39561947. The reversal of 39561944 is 44916593.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39561943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2472614 + ... + 2472629.

Almost surely, 2^39561944 is an apocalyptic number.

It is an amenable number.

39561944 is a deficient number, since it is larger than the sum of its proper divisors (34616716).

39561944 is a wasteful number, since it uses less digits than its factorization.

39561944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4945249 (or 4945245 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 39561944 is about 6289.8286145173. The cubic root of 39561944 is about 340.7421619687.

The spelling of 39561944 in words is "thirty-nine million, five hundred sixty-one thousand, nine hundred forty-four".