39866645 has 24 divisors (see below), whose sum is σ = 59936184. Its totient is φ = 25232256.

The previous prime is 39866627. The next prime is 39866647. The reversal of 39866645 is 54666893.

It can be written as a sum of positive squares in 4 ways, for example, as 5866084 + 34000561 = 2422^2 + 5831^2 .

It is not a de Polignac number, because 39866645 - 2¹⁰ = 39865621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39866645.

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 23 ways as a sum of consecutive naturals, for example, 3074 + ... + 9443.

It is an arithmetic number, because the mean of its divisors is an integer number (2497341).

Almost surely, 2^39866645 is an apocalyptic number.

39866645 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39866645 is a deficient number, since it is larger than the sum of its proper divisors (20069539).

39866645 is a wasteful number, since it uses less digits than its factorization.

39866645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12549 (or 12542 counting only the distinct ones).

The product of its digits is 933120, while the sum is 47.

The square root of 39866645 is about 6314.0038802649. The cubic root of 39866645 is about 341.6147097939.

The spelling of 39866645 in words is "thirty-nine million, eight hundred sixty-six thousand, six hundred forty-five".