39640444 has 12 divisors (see below), whose sum is σ = 71608768. Its totient is φ = 19180800.

The previous prime is 39640439. The next prime is 39640457. The reversal of 39640444 is 44404693.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159717 + ... + 159964.

Almost surely, 2^39640444 is an apocalyptic number.

It is an amenable number.

39640444 is a deficient number, since it is larger than the sum of its proper divisors (31968324).

39640444 is a wasteful number, since it uses less digits than its factorization.

39640444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319716 (or 319714 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 39640444 is about 6296.0657556922. The cubic root of 39640444 is about 340.9673833550.

The spelling of 39640444 in words is "thirty-nine million, six hundred forty thousand, four hundred forty-four".