39664018 has 4 divisors (see below), whose sum is σ = 59496030. Its totient is φ = 19832008.

The previous prime is 39663997. The next prime is 39664019. The reversal of 39664018 is 81046693.

39664018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22250089 + 17413929 = 4717^2 + 4173^2 .

It is not an unprimeable number, because it can be changed into a prime (39664019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9916003 + ... + 9916006.

Almost surely, 2^39664018 is an apocalyptic number.

39664018 is a deficient number, since it is larger than the sum of its proper divisors (19832012).

39664018 is a wasteful number, since it uses less digits than its factorization.

39664018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19832011.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 39664018 is about 6297.9375989287. The cubic root of 39664018 is about 341.0349605685.

The spelling of 39664018 in words is "thirty-nine million, six hundred sixty-four thousand, eighteen".