39986644 has 24 divisors (see below), whose sum is σ = 72186408. Its totient is φ = 19368960.

The previous prime is 39986641. The next prime is 39986651. The reversal of 39986644 is 44668993.

It can be written as a sum of positive squares in 4 ways, for example, as 2016400 + 37970244 = 1420^2 + 6162^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39986641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24972 + ... + 26524.

It is an arithmetic number, because the mean of its divisors is an integer number (3007767).

Almost surely, 2^39986644 is an apocalyptic number.

It is an amenable number.

39986644 is a deficient number, since it is larger than the sum of its proper divisors (32199764).

39986644 is a wasteful number, since it uses less digits than its factorization.

39986644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755 (or 1753 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The square root of 39986644 is about 6323.4993476714. The cubic root of 39986644 is about 341.9571210334.

The spelling of 39986644 in words is "thirty-nine million, nine hundred eighty-six thousand, six hundred forty-four".