39866644 has 12 divisors (see below), whose sum is σ = 69811168. Its totient is φ = 19920600.

The previous prime is 39866627. The next prime is 39866647. The reversal of 39866644 is 44666893.

It is a junction number, because it is equal to n+sod(n) for n = 39866594 and 39866603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39866647) 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, 9379 + ... + 12949.

Almost surely, 2^39866644 is an apocalyptic number.

It is an amenable number.

39866644 is a deficient number, since it is larger than the sum of its proper divisors (29944524).

39866644 is a wasteful number, since it uses less digits than its factorization.

39866644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6366 (or 6364 counting only the distinct ones).

The product of its digits is 746496, while the sum is 46.

The square root of 39866644 is about 6314.0038010758. The cubic root of 39866644 is about 341.6147069376.

The spelling of 39866644 in words is "thirty-nine million, eight hundred sixty-six thousand, six hundred forty-four".